8. Boldt Castle

The story of Boldt Castle is a rather sad one, with the building never being completed to its creator’s full vision. George Boldt, manager of the famed Waldorf-Astoria hotel in New York City, began building the castle in 1900 as a present for his wife, Louise. The couple already had a home on Hart Island, but he wanted something grand for her.

Despite hiring hundreds of laborers to complete his grand for a traditional stone castle, his wife died only four years into the construction process. She would never be able to see her husband’s vision come to fruition. Much of the building was left exposed to the elements, but visitors can still visit what remains by boat.