If you ever ride a Hudson line MetroNorth train, just north of West Point, and south of the town of Beacon, along the Hudson you'll see a mysterious abandoned structure on an island in the middle of the river. In the early 20th century, Frank Bannerman, a dealer in surplus military equipment built a warehouse in the form of a castle on this island. This warehouse was in use until the 1950's, had a major fire in the 1960s, and remains a very interesting set of ruins for which an effort is being made to stablize the remaining structures.
There are limited tours being operated by the Bannerman Castle Trust (http://www.bannermancastle.org) and as you can see hardhats are required.
Near the bottom are the ruins of the family's residence, also on the island.
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