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Boldt Castle


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Boldt Castle, located near Alexandria Bay, NY in the famed 1000 Islands is once again becoming what it was always meant to be, the premier home and attraction on the St. Lawrence River.

Boldt Castle on Heart Island is the setting for the saddest love story ever told and an important RiverQuest destination. Accessible by water taxi, tour boats and private boat, the castle is open for self-guided tours of its six stories, featuring 120 rooms, tunnels, a powerhouse, Italian gardens, a drawbridge, and much more. Wander the Castle or visit the Boldt Yacht House on Wellesley Island and see the docked 1892 Kestrel, a 63-foot steam yacht, similar to those popular on the St. Lawrence River at the turn-of-the-century.


At the turn-of-the-century, George C. Boldt, millionaire proprietor of the world famous Waldorf Astoria Hotel in New York City, set out to build a full size rhineland castle on Heart Island as a display of his love for his wife, Louise. In January 1904, Boldt commanded to immediately stop all construction, as his beloved Louise had suddenly died. Broken hearted, Boldt never returned to the island, leaving behind the castle and various stone structures as a monument to his love.

What You'll See

Some of the highlights to see and experience:

  • On Heart Island, you will find six impressive structures to explore including the Castle, the Power House, the Alster Tower, the Hennery, the Arch, and a stone Gazebo.
  • Inside the Yacht House, you will find a collection of antique wooden boats on display – courtesy of the Antique Boat Museum located in Clayton NY.  Some of the boats on display are from the original Boldt fleet. The Yacht House is open from May 12 -September 30, 10:30am – 5:30pm. A shuttle from Heart Island provides access to the Boldt Castle Yacht House.