Sightseeing
Local GemBrockville
FreeOntario's City of the 1000 Islands, with a historic St. Lawrence River waterfront, trails and craft breweries.
Photo: Clément Bardot, CC BY-SA 3.0, via Wikimedia Commons. Cropped and resized.
SightseeingHistory BuffDate NightFamily Favorite
Boldt Castle
Boldt Castle is a sightseeing stop in Alexandria Bay, NY, part of the National Capital Region guide. Cost: under $25. Open May 9 through October 12, 2026.
Heart Island, St. Lawrence River, reached by boat · Alexandria Bay, NY
Why you should go…
Boldt Castle stands on Heart Island in the St. Lawrence River and can only be reached by water, on tour boats from the U.S. and Canadian shores or by private boat. Hotel magnate George C. Boldt began it in 1900 as a gift for his wife, Louise, and work stopped in 1904 after she died. You can walk through restored, furnished rooms on the first two floors. The grounds include the Power House and the Alster Tower, which holds a two-lane bowling alley.
- #castle
- #thousand islands
- #boat tour
- #historic mansion
- #gardens
What's around here?
The closest stops to Boldt Castle, ordered by straight-line distance.
