Boldt Castle & Yacht House

Visit this extraordinary castle built by George C. Boldt.

New York’s Thousand Isles once served as a playground for wealthy and famous families. Boldt saw it as the prime location for the castle he envisioned to build for his family. The project started in the 1900s with the help of thousands of workers, but he immediately suspended construction upon the death of his wife. It wasn’t until 70 years later that the Thousand Islands Bridge Authority bought out the property and restored it. The castle is located on Heart Island and includes 120 rooms, a drawbridge, tunnels, and the iconic Alster Tower (serving as a children’s playhouse). 

The Boldt Castle is only accessible by boat. You can book local tour boats or take a personal craft to dock near these sites. Both the castle and yacht house are open seasonally from early May to early October. Hours of operation are 10:30 am to 6:30 pm. Tickets are required to tour the Boldt castle and yacht house. This is a unique place that children and adults of all ages can enjoy.