(Photo's courtesy of Suck Pants)
...Bannerman Island, it is the site of Bannerman's Castle. While the two versions of the name are "Pollepel" and "Pollopel", the correct term is "Pollepel",from the Dutch word for a wooden spoon. Pollepel Island is about 50 miles (80 km) north of New York City and about 1,000 feet (300 m) from the Hudson River's eastern shore.
It contains about 6.5 acres (26,000 m2) — most of it rock. The principal feature on the island is Bannerman's Castle, an abandoned military surplus warehouse. It was built in the style of a castle by businessman Francis Bannerman VI (1851–1918). It remains one of a very small number of structures in the United States which can properly be called a castle. Pollepel Island is sometimes referred to as Bannerman's Island. One side of the castle carries the words "Bannerman's Island Arsenal".
-- Source: Wikipedia