Boldt Castle
A vast unfinished castle on Heart Island.
The Thousand Islands
Nearly 2,000 islands in the St. Lawrence River, with a heartbreaking castle and the namesake salad dressing.
George Boldt, the Waldorf-Astoria's owner, began a Rhine-style castle on Heart Island for his wife, then stopped forever when she died in 1904. Boats tour the islands, past homes that take up whole rocks.
- Best Time
- June–September
- Time Needed
- 1–2 days
- Cost Level
- $$$$
- Open
- Check before you go; hours vary by season
- Getting There
- About five hours by car from New York City.
What to See
0 of 2 are freeRiver Boat Tours
Past mansions, and Singer Castle.
Know Before You Go
- Going over the Canadian side requires a passport.
Where to Stay
Stay in Alexandria Bay or Clayton.
Where to Eat
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Last checked 2026-11-02. Part of the Northeast list.