Boldt Castle is located in the village of Alexandria Bay, in the State of New York, United States. The castle is situated on the five-acre Heart Island in the Saint Lawrence River. The millionaire George Boldt, owner of the world famous Waldorf Astoria Hotel located in New York City, built the castle in 1900 to display his love for his wife, Louise. The six-story, 120-room castle was set to become one of the largest private homes in the U.S. The castle boasts tunnels, a gazebo, the Power House, Italian gardens, a drawbridge, a dovecote, and Alster Tower. Alster Tower was used as a place to entertain guests, the “Shell Room” was used for dancing, while the basement housed a bowling alley, and the upper floors had a billiard room, library, bedrooms, café, and kitchen. The Power House and Clock Tower are located on the eastern side of the island and were designed to resemble a medieval tower, this structure once housed the generators that supplied electricity to the island, but most of the original equipment is gone. Unfortunately, Louise died in 1904, and being heartbroken, Boldt never returned to Heart Island. For 73 years the castle was left abandoned. It was eventually acquired by the Thousand Island Bridge Authority, who spent over 15 million to restore the property. Boldt Castle is seasonally open to the public. The island is accessible by boat and has a gift shop along with food and beverage concessions.