Pollepel Island is a small island located in the Hudson River, near the town of Beacon in New York. It covers approximately 6.5 acres and is known for its rugged terrain and scenic views. The island is uninhabited and is primarily accessible by boat. The island is home to the ruins of Bannerman's Castle, a military surplus warehouse built in the early 1900s by Francis Bannerman VI. The castle and its surrounding structures have become a popular subject for photographers and hikers, attracting visitors interested in history and nature.