Bannerman Castle is a historic military-style castle located on Pollepel Island in the Hudson River, New York. Built in the early 1900s by Francis Bannerman VI, a Scottish-American arms dealer, the castle served as a storage facility for his extensive collection of military surplus. Its unique architecture features turrets and stone walls, resembling a Scottish castle. Today, Bannerman Castle is a popular tourist destination and is accessible by boat. The site is managed by the Bannerman Castle Trust, which offers guided tours and educational programs about the castle's history and its significance in the region.