Castles of the Thousand Islands

Scattered among the pine-clad islets of the St. Lawrence River, the castles of the Thousand Islands stand as some of the most romantic—and revealing—remnants of the Gilded Age. Built between the late nineteenth and early twentieth centuries, these dramatic structures were not medieval fortresses, but expressions of wealth, ambition, and imagination in an era when America’s elite sought to leave a lasting mark on the landscape.

The most famous of these is Boldt Castle, commissioned by hotel magnate George C. Boldt on Heart Island. Conceived as a grand tribute to his wife, the six-story castle blended Rhineland romanticism with modern luxury, complete with tunnels, towers, and formal gardens. When Mrs. Boldt died suddenly in 1904, construction halted overnight, leaving the castle unfinished for decades and turning it into a poignant symbol of love and loss.

Just downriver, Singer Castle on Dark Island offered a more fortified vision. Built by Frederick Bourne, president of the Singer Sewing Machine Company, it combined Old World styling with modern engineering. Secret passageways, hidden staircases, and thick stone walls reflected both Bourne’s desire for privacy and the era’s fascination with security and intrigue. Unlike Boldt Castle, Singer Castle was fully completed and remains remarkably intact today.

Completing the trio is Calumet Castle, perched on Calumet Island and commissioned by Chicago industrialist Charles G. Emery. Smaller and more restrained than its neighbors, Calumet Castle nevertheless embraced medieval European design, with crenellated towers and solid stone construction. Emery envisioned it as a dignified summer residence rather than a public spectacle, emphasizing exclusivity and permanence. Though privately owned and less accessible, Calumet Castle adds an important counterpoint to the region’s grander showpieces.

Together, these castles helped shape the Thousand Islands’ identity. Steamship tours highlighted their turrets and towers, reinforcing the region’s reputation as a place where American wealth met European fantasy. Built of stone in a landscape dominated by wooden cottages, they signaled endurance in a seasonal world.

Today, the castles of the Thousand Islands remain enduring landmarks. They tell stories of immense fortune, personal aspiration, and the Gilded Age belief that architecture itself could declare legacy—rising from the river as timeless monuments to ambition and imagination.

ABOUT MADISON’S MISSION:

Step into the captivating world of Boldt Castle in 1903, where dreams are forged in the fires of adversity and love. Madison Murray, maid to Louise Boldt, harbors a singular mission—to care for her ailing mistress while hiding her own painful past. She meets Emmett O’Connor, but just as their relationship grows, tragedy shatters their world, and Madison is ensnared in a dangerous coverup. When Mrs. Boldt passes away, Madison is left reeling, can she move forward? Will Emmett forge a future alongside the woman who has captured his heart?

ABOUT SUSAN:

Susan G Mathis is an international award-winning, multi-published author of stories set in the beautiful Thousand Islands in upstate NY. Susan has been published more than thirty times in full-length novels, novellas, and non-fiction books. She has sixteen in her fiction line. Susan is also a published author of two premarital books, stories in a dozen compilations, and hundreds of published articles. Susan lives in Northern Virginia and enjoys traveling the world. Visit www.SusanGMathis.com/fiction for more.

 

The Children’s Playhouse on Heart Island

One of the first—and only—structures the Boldts got to enjoy while Boldt Castle was being built is Alster Tower. Often referred to as the "Children’s Playhouse," this unique building offers a glimpse into the opulent recreational life of the Boldt family during the early 20th century and illustrates George C. Boldt's imaginative vision and love for his family.

Completed in 1899, Alster Tower was completed before the construction of the grand Boldt Castle. George Boldt, the millionaire proprietor of the Waldorf-Astoria Hotel in New York City, envisioned the tower as a space dedicated to leisure and entertainment for his family and guests. Unlike the main castle, which remained unfinished due to the untimely death of Boldt's wife, Louise, the family actively used Alster Tower during their summers on Heart Island. 

Alster Tower's design is a departure from conventional architecture created to reflect the charm of medieval European castles. The structure features slanting and uneven walls, ceilings, and roofs, and the deliberate irregularity adds to its whimsical character, making it the most architecturally unique building on the island. 

In Madison’s Mission, Mrs. Boldt rests in the Venetian Room and the Boldts entertain here, too. The Tower’s recreational facilities reflects Boldt's commitment to providing unparalleled entertainment. Its amenities included a two-lane Bowling Alley, Billiard Room, Venetian Room, Library, Shell Room and Theater with a stage for performances and entertainment. 

These features made Alster Tower the center for recreation and socialization for the Boldt family and their guests, even before the castle was ready to enjoy. 

After years of exposure to the elements and periods of neglect, restoration efforts are working to revitalize Alster Tower. The Thousand Islands Bridge Authority undertook extensive work, including masonry restoration, veranda reconstruction, and interior refurbishments. By 2014, the tower was reopened to the public, allowing visitors to experience its historical and architectural significance firsthand. And the work continues. 

Today, Alster Tower stands as a captivating piece of the Boldt Castle estate. Visitors can explore its unique rooms and envision the lively gatherings that once took place within its walls. The tower's distinctive design and rich history offer a fascinating glimpse into the lavish lifestyle of the Gilded Age elite. Whether you're an architecture enthusiast, a history buff, or simply curious, Alster Tower on Heart Island is a destination that promises to enchant and inspire.

ABOUT MADISON’S MISSION:

Step into the captivating world of Boldt Castle in 1903, where dreams are forged in the fires of adversity and love. Madison Murray, maid to Louise Boldt, harbors a singular mission—to care for her ailing mistress while hiding her own painful past. She meets Emmett O’Connor, but just as their relationship grows, tragedy shatters their world, and Madison is ensnared in a dangerous coverup. When Mrs. Boldt passes away, Madison is left reeling, can she move forward? Will Emmett forge a future alongside the woman who has captured his heart?

ABOUT SUSAN:

Susan G Mathis is an international award-winning, multi-published author of stories set in the beautiful Thousand Islands in upstate NY. Susan has been published more than thirty times in full-length novels, novellas, and non-fiction books. She has fourteen in her fiction line. Susan is also a published author of two premarital books, stories in a dozen compilations, and hundreds of published articles. Susan lives in Colorado Springs and enjoys traveling the world. Visit www.SusanGMathis.com/fiction for more.

A Castle Rising from Ruins

Boldt Castle is one of the most romantic and famous landmarks in New York State. Located on Heart Island in the Thousand Islands, the castle was once an extravagant and heartfelt gesture of love from hotel magnate George C. Boldt to his wife Louise. When tragedy turned that dream into a haunting ruin, it sat empty and in decay for decades until a remarkable restoration brought it back to life. The Boldt Castle renovation is more than just a story of architecture—it’s a rebirth of history, passion, and purpose.

When Louise Boldt died unexpectedly in 1904, George Boldt was devastated, and construction on the castle immediately ceased. Workers were told to leave the island, and George never returned. The castle, exposed to the harsh Northern New York winters, vandals, and the slow decay of time, was left to the elements for more than seven decades.

Windows shattered, floors rotted, mold crept in, and ivy climbed over what was meant to be a castle of love. For decades, it stood as a haunting reminder of what might have been—a romantic corpse that captured imaginations but seemed destined to crumble.

In 1977, the Thousand Islands Bridge Authority (TIBA) acquired Heart Island and the unfinished castle for just one dollar on the condition that all proceeds from admission and tourism had to go directly back into restoring and preserving the property.

Now, the decades-long labor of love is not unlike George Boldt’s original vision. The restoration of Boldt Castle has been one of New York’s most ambitious historic preservation projects to date. The TIBA and hundreds of craftsmen, historians, and artisans have carefully worked to preserve the castle’s original design, all the while making it accessible and safe for visitors.

What makes the Boldt Castle renovation so special is that it’s meant to both preserve history and continue a love story. The entire island a tribute to the vision George Boldt had for his wife Louise—a vision that, though interrupted, has finally been honored.

The restoration continues to this day, so every year I visit the castle and Heart Island to experience its new and exciting developments. As new rooms are opened and old ones are improved, the goal is not to complete the castle in the traditional sense, but to tell its story—to let visitors walk through love, loss, and legacy.

Today, Boldt Castle welcomes nearly a quarter million visitors annually. Couples wed. Family frolic, history lovers learn. And romantics come to Heart Island to not only admire a castle, but to feel the love through a story that never truly ended. Boldt Castle is a living monument—a place where craftsmanship, dedication, and memory meet on the shores of the St. Lawrence River.

ABOUT MADISON’S MISSION:

Step into the captivating world of Boldt Castle in 1903, where dreams are forged in the fires of adversity and love. Madison Murray, maid to Louise Boldt, harbors a singular mission—to care for her ailing mistress while hiding her own painful past. She meets Emmett O’Connor, but just as their relationship grows, tragedy shatters their world, and Madison is ensnared in a dangerous coverup. When Mrs. Boldt passes away, Madison is left reeling, can she move forward? Will Emmett forge a future alongside the woman who has captured his heart?

ABOUT SUSAN:

Susan G Mathis is an international award-winning, multi-published author of stories set in the beautiful Thousand Islands in upstate NY. Susan has been published more than thirty times in full-length novels, novellas, and non-fiction books. She has fourteen in her fiction line. Susan is also a published author of two premarital books, stories in a dozen compilations, and hundreds of published articles. Susan lives in Colorado Springs and enjoys traveling the world. Visit www.SusanGMathis.com/fiction for more.

The Boldt Castle Love Story

In the heart of the Thousand Islands on the St. Lawrence River, Heart Island’s Boldt Castle is like something from a fairytale. Its turrets and towers and its pristine gardens and river views awakens the imagination. 

The story of George and Louise Boldt is one of love, loss, devotion, and inspiration that doesn’t fail to touch the heart. And when you visit the memorial of that love, Boldt Castle, you’ll never forget it.

George Charles Boldt was born in Prussia in 1851 and immigrated to the United States as a teenager. With nothing but ambition and charm, he made his way up the ranks of the hotel industry, eventually becoming manager of the world-famous Waldorf-Astoria Hotel in New York City and the Bellevue-Stratford Hotel in Philadelphia.

Behind his rise to success was his wife, Louise Kehrer Boldt, a woman who had always believed in him. She was just fifteen when she and George married in 1877, but they quickly became an incredible team. George handled business, while Louise brought grace and social savvy to their shared enterprises. Together, they influenced not only hotels but the very concept of luxury hospitality. They were the epidemy of a power couple, admired in wealthy circles for their attention to detail, generosity, and deep love for each other.

They spent many summers in the Thousand Islands, a popular escape for the wealthy during the Gilded Age. Here, George’s most extravagant gift to Louise took shape. In 1900, George Boldt set out to build a full-scale Rhineland-style castle on Heart Island as a monument to his beloved wife. He spared no expense—120 rooms, tunnels, gardens, towers, and even a dove cote for Louise’s favorite birds. Every stone, every detail declared his love and legacy.

Boldt Castle was to be their summer paradise, a memorial to their shared dreams. But in 1904, just as the castle neared completion, tragedy struck. Louise died suddenly at the age of 42.

Grief-stricken, George immediately halted all construction. He never returned to the island. Boldt Castle, the grand expression of his love, was left incomplete—abandoned to the elements and time. For more than 70 years, the structure stood silent, a symbol of love lost.

But their love story continued to captivate anyone who heard of their tale or visited the Thousand Islands. In 1977, the Thousand Islands Bridge Authority took over the property and began restoring it—not to fulfill George's original dream, but to preserve the love story behind it.

Today, Boldt Castle is one of the most beloved tourist attractions in upstate New York. Visitors walk its grand halls and manicured grounds not just to marvel at its beauty, but to feel the heartbeat of a man’s devotion to the woman who shaped his life.

George Boldt died in 1916, never having completed the castle. But their love story lives on today. Nearly a quarter million visitors experience the story of Boldt Castle, Heart Island, and a couple who lived a life of love.

ABOUT MADISON’S MISSION:

Step into the captivating world of Boldt Castle in 1903, where dreams are forged in the fires of adversity and love. Madison Murray, maid to Louise Boldt, harbors a singular mission—to care for her ailing mistress while hiding her own painful past. She meets Emmett O’Connor, but just as their relationship grows, tragedy shatters their world, and Madison is ensnared in a dangerous coverup. When Mrs. Boldt passes away, Madison is left reeling, can she move forward? Will Emmett forge a future alongside the woman who has captured his heart?

ABOUT SUSAN:

Susan G Mathis is an international award-winning, multi-published author of stories set in the beautiful Thousand Islands in upstate NY. Susan has been published more than thirty times in full-length novels, novellas, and non-fiction books. She has fourteen in her fiction line. Susan is also a published author of two premarital books, stories in a dozen compilations, and hundreds of published articles. Susan lives in Colorado Springs and enjoys traveling the world. Visit www.SusanGMathis.com/fiction for more.

A Millionaire’s Farm Cottage?

George Boldt's Wellesley House stood as a reminder of the grandeur and ambition of the Gilded Age. While often overshadowed by the more renowned Boldt Castle on Heart Island, Wellesley House offered a fascinating glimpse into the life and legacy of the hotel magnate George C. Boldt.

In the late 19th century, George C. Boldt, the proprietor of New York City's Waldorf-Astoria Hotel and Philadelphia's Bellevue-Stratford Hotel, began acquiring land on Wellesley Island. His vision was to create a summer retreat that mirrored the opulence and sophistication of his urban establishments as well as provide for his hotels. 

By 1899, Boldt had purchased several hundred acres of farmland from the Cornwall brothers, laying the foundation for what would become the Wellesley House estate. Though Mrs. Boldt called it their “summer cottage,” it was no ordinary dwelling. During the building of Boldt Castle, George and Louise stayed in the Wellesley House, making it a centerpiece for Madison’s Mission. 

Wellesley House had over fifty rooms, the mansion featured intricate architectural details and was strategically positioned along a man-made canal between Wellesley Island and Tennis Island. This canal, a remarkable feat of engineering, was approximately two miles long, seventy feet wide, and ten feet deep, facilitating direct access to Lake Waterloo. The canal's construction involved extensive dredging and blasting through solid rock, reflecting Boldt's commitment to creating a seamless and luxurious environment.  

The Wellesley House estate was also a hub of agricultural innovation and social activity. Boldt established modern stables and raised high-quality stock, supplying his hotels with fresh produce and dairy products directly from his Wellesley Island farms. The estate eventually featured a golf course, tennis courts, and meticulously landscaped gardens, offering guests a plethora of recreational activities. 

Nearby the Wellesley House was the Boldt Yacht House on the northeastern shore of Wellesley Island. Completed in 1903, this shingle-style structure housed the Boldt family's fleet of yachts and boats. The yacht house is a beauty in itself with towering bay doors, a workshop for building racing launches, and accommodations for crew and staff. Today, it stands as the only remaining wooden yacht house of its kind and is listed on the National Register of Historic Places. 

Following the untimely death of Louise Boldt in 1904, construction on Boldt Castle ceased, and George Boldt's focus shifted to his Wellesley Island properties. The Wellesley House continued to serve as a cherished family retreat and a place for entertaining distinguished guests. Over the years, the estate changed hands but remained a symbol of the lavish lifestyle and visionary pursuits of George C. Boldt.  

ABOUT MADISON’S MISSION:

Step into the captivating world of Boldt Castle in 1903, where dreams are forged in the fires of adversity and love. Madison Murray, maid to Louise Boldt, harbors a singular mission—to care for her ailing mistress while hiding her own painful past. She meets Emmett O’Connor, but just as their relationship grows, tragedy shatters their world, and Madison is ensnared in a dangerous coverup. When Mrs. Boldt passes away, Madison is left reeling, can she move forward? Will Emmett forge a future alongside the woman who has captured his heart?

ABOUT SUSAN:

Susan G Mathis is an international award-winning, multi-published author of stories set in the beautiful Thousand Islands in upstate NY. Susan has been published more than thirty times in full-length novels, novellas, and non-fiction books. She has fourteen in her fiction line. Susan is also a published author of two premarital books, stories in a dozen compilations, and hundreds of published articles. Susan lives in Colorado Springs and enjoys traveling the world. Visit www.SusanGMathis.com/fiction for more.

George C. Boldt: The Visionary Behind the Luxury Hotel Experience

George C. Boldt, the man who created the soaring towers of Boldt Castle in the Thousand Islands, is an interesting character. He wasn’t just a man of wealth—he was a visionary for his time. Not only did he dream of the beautiful castle, a gift for his beloved wife, but he was a man innovation, determination, and brilliance that forever changed the American hospitality industry.

He came to America as a poor boy, worked hard, and built a fortune one guest at a time. Born in Prussia in 1851, George Charles Boldt immigrated to the United States as a teenager with little more than ambition and work ethic. His career began modestly as a kitchen worker in New York City, but it didn’t take long for his talent to shine.

In Philadelphia, he rose through the hotel ranks until he was hired to manage the Bellevue Hotel. There, he transformed a local business into one of the most prestigious destinations in the country. His secret was his attention to detail, impeccable service, and a luxury experience like no other.

In 1890, George supervised the construction of the Bellevue-Stratford Hotel in Philadelphia where he combined two buildings into one great property. The opulent architecture, cutting-edge amenities, and focus on elite service, quickly gave it the reputation as “the most luxurious hotel in America.”

Boldt began and then popularized concepts that we now take for granted in upscale hotels—private bathrooms in each suite, gourmet dining, personalized guest services, and lavish ballrooms. Under his leadership, hospitality became an experience, not just a necessity.

Perhaps Boldt’s most well-known achievement was the transformation of the Waldorf Hotel in New York City. Originally managed by William Waldorf Astor, the Waldorf stood alone until Boldt engineered a brilliant merger with the neighboring Astoria Hotel, owned by rival cousin John Jacob Astor IV.

Boldt not only managed the delicate family negotiations, but he also managed the merger of the two hotels into the legendary Waldorf-Astoria. Now, it wasn’t just a hotel—it was a New York City landmark. With over 1,000 rooms, it was the largest hotel in the world at the time and became the preferred choice for presidents, royalty, and the rich and famous.

Thanks to Boldt’s innovation, the Waldorf-Astoria set a new standard for urban luxury and sophistication. His business acumen went far beyond bricks and mortar. He became famous for his progressive treatment of staff, fair wages, and attention to employee well-being that was rare in the Gilded Age. He was also a generous philanthropist, quietly supporting hospitals, schools, and churches.

But back to Boldt Castle. It was his personal passion, an extravagant gift of love to his wife Louise. But even though she died before its completion, the castle remains one of the most famous landmarks in the Thousand Islands, a monument to his heart and imagination.

Though George C. Boldt passed away in 1916, his influence still echoes through the hallways of luxury hotels around the world. He set standards that became standard, he had the vision to treat his workers well, and he brought elegance to hospitality that have become the norm for the modern luxury hotel.

He didn’t just manage hotels—he transformed them. And that legacy, much like the castle that bears his name, is built to last.

ABOUT MADISON’S MISSION:

Step into the captivating world of Boldt Castle in 1903, where dreams are forged in the fires of adversity and love. Madison Murray, maid to Louise Boldt, harbors a singular mission—to care for her ailing mistress while hiding her own painful past. She meets Emmett O’Connor, but just as their relationship grows, tragedy shatters their world, and Madison is ensnared in a dangerous coverup. When Mrs. Boldt passes away, Madison is left reeling, can she move forward? Will Emmett forge a future alongside the woman who has captured his heart?

ABOUT SUSAN:

Susan G Mathis is an international award-winning, multi-published author of stories set in the beautiful Thousand Islands in upstate NY. Susan has been published more than thirty times in full-length novels, novellas, and non-fiction books. She has fourteen in her fiction line. Susan is also a published author of two premarital books, stories in a dozen compilations, and hundreds of published articles. Susan lives in Colorado Springs and enjoys traveling the world. Visit www.SusanGMathis.com/fiction for more.

The Thousand Islands Gilded Age

By Susan G Mathis

Between New York state and Ontario, Canada, where Lake Ontario narrows and becomes the St. Lawrence River are more than 1800 islands known as The Thousand Islands. Here is where the Great Lakes and the St. Lawrence River intersect to become the world’s largest inland navigation system. Huge freighters pass by tiny islands along the main channel and share the waterway with all kinds of boats including kayaks and canoes!

In 1872, George M. Pullman invited President Ulysses S. Grant to visit his small island during the reelection campaign, as well as several Civil War heroes including General Sheridan. When George Pullman originally created this summer residence, it wasn’t much more than a simple frame cottage and dock. But by 1872, he’d expanded his 5-acre island to include a much larger and nicer cottage where they could entertain, a massive boathouse, pumps, and an ice house. And entertain he did! 

When President Grant and his entourage came, the Thousand Islands became a national event. The press touted the Thousand Islands as THE place to summer for the rich and famous and common man alike. 

In so doing—and thanks to excited journalists—he launched The Thousand Islands Gilded Age season of the rich and famous buying islands and lots along the mainland and building castles, mansions, and magnificent summer homes. Those islands, those homes have delightful, intriguing, and often poignant stories to tell. And I aim to tell a lot of those stories, including Katelyn’s Choice that tells the Pullman Island story. 

From 1872 until 1912 the Thousand Islands Gilded Age brought tens of thousands of visitors to the enchanting summer resort. Grand hotels popped up. The rich scooped up islands and built fancy mansions and castles they called cottages and hunting lodges. The middle class bought small parcels of land along the mainland and built simple cottages. 

And tourism took off. 

The railroad expanded to bring in tourists and landowners. Large side-paddle steamboats toured passengers around the islands, and distinguished visitors made it the summer resort to visit. They came from New York City, Chicago, Cleveland, Pittsburgh, and many other places. 

Several of the amazing castles and beautiful summer homes you can still tour today including Boldt Castle and “The Towers” on Dark Island (now called Singer Castle) which is the setting for my latest novel, Devyn’s Dilemma, that releases April 2^nd. 

Would you like to visit the Thousand Islands? 

Leave your answer or comments on the post below and join me on May 19^th for my next post. 

Check out Devyn’s Dilemma, Book 2 of the Thousand Islands Gilded Age series, coming April 2!

Devyn McKenna is forced to work in the Towers on Dark Island, one of the enchanting Thousand Islands. But when Devyn finds herself in service to the wealthy Frederick Bourne family, her life takes an unexpected turn. 

Brice McBride is Mr. Bourne’s valet as well as the occasional tour guide and under butler. Brice tries to help the mysterious Devyn find peace and love in her new world, but she can’t seem to stay out of trouble—especially when she’s accused of stealing Bourne’s money for Vanderbilt’s NYC subway expansion. 

About Susan: 

Susan G Mathis is a multi-published author of stories set in the beautiful Thousand Islands, her childhood stomping ground in upstate NY. Katelyn’s Choice, the first in The Thousand Islands Gilded Age series, is available now, and book two, Devyn’s Dilemma, releases in April, 2020. The Fabric of Hope: An Irish Family Legacy, Christmas Charity, and Sara’s Surprise are available now. Visit www.SusanGMathis.com for more.

Susan is also a published author of two premarital books with her husband, Dale, two children's picture books, stories in a dozen compilations, and hundreds of published articles. Susan makes her home in Colorado Springs, enjoys traveling globally with her wonderful husband, Dale. 

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