Here, the water does most of the talking. Boats move between forested islands, the shoreline opens into endless blue, and on Heart Island, Boldt Castle rises like something pulled from a romantic legend.
Built between 1900 and 1904, the six-storey castle was commissioned by George Boldt, the hotelier behind New York’s Waldorf Astoria, as a grand tribute to his wife, Louise. With 120 rooms, rose granite walls, towers, tunnels, gardens, and sweeping river views, it was meant to be one of the most extraordinary private homes in North America.
Then Louise died. Heartbroken, Boldt ordered construction to stop immediately. He never returned to the island. For 73 years, the unfinished castle stood abandoned, its love story frozen in stone.
On Saturday morning, you board a helicopter in Gananoque and rise above the Thousand Islands. The St. Lawrence River stretches endlessly below as Boldt Castle appears on Heart Island like something from a fairytale.
From the air, the story feels heavier. George Boldt built the castle as a grand tribute to his wife, Louise, before her death brought construction to an abrupt end.
Singer Castle
Nearby, Singer Castle rises from Dark Island with the same Gilded Age grandeur. Built by Frederick Bourne of the Singer Sewing Machine empire, it reflects the same era’s obsession with turning love, wealth, and legacy into architecture.
The helicopter changes everything. Boat tours show you the castles. From the air, you understand why they matter. The St. Lawrence curves through the landscape as islands scatter below like fragments of another world. You see how isolated these castles truly are—built on tiny islands surrounded by open water, far from everything. Their scale feels more ambitious from above. So does the emotion behind them.
You start to understand the kind of vision it took to build them here and the heartbreak that left one unfinished.
From above, Singer Castle reflects the light in a unique way. Its stone towers and steep roofs reveal the Scottish-inspired design envisioned by architect Ernest Flagg, a castle that feels transported from medieval Europe yet somehow belongs perfectly among the Thousand Islands.
The aerial view exposes details impossible to notice from the water, including the hidden passageways woven into the structure’s design.
Nearby, Boldt Castle completely transforms Heart Island. George Boldt didn’t just build a mansion here; he reshaped the island itself into a monument to love, redesigning the shoreline to match his grand vision for Louise.
The flight is short, but long enough to stay with you. Just enough time for the adrenaline to rise before the river pulls your attention somewhere quieter.
When you land back in Gananoque, the town feels different. Slower. Softer. You spend Saturday evening by the water, watching boats drift through the marina as the sun drops behind the islands. Dinner overlooking the river. A late walk along the shoreline. Sunday morning breakfast before the two-hour drive back to Toronto.
In one weekend, you’ve seen two of North America’s most romantic tragedies from the sky. You’ve watched Gilded Age fortunes turn grief into architecture, castles built as declarations of love and left behind when love was lost. That alone makes the trip unforgettable.
The Need To Know Details
- What: Thousand Islands Two Castle Helicopter Tour: 30-minute aerial tour of Boldt and Singer Castles
- When: Available year-round, weather permitting. Book in advance for best availability
- Where: Departs from 1000 Islands Helicopter Tours, 88 County Road 32, Gananoque, Ontario K7G 2V3 Cost: Check the website for different tours. Minimum 2 people per booking. Headsets included. DVD video of your flight
- Weekend stay: Gananoque has hotels, bed and breakfasts, and riverside restaurants. Alexandria Bay across the river
- Getting there: Gananoque is 2 hours driving east from Toronto on Highway 401. Passport recommended if necessary.
- Website: https://www.fly1000islands.ca/heli-tours
