What’s that Medieval Castle doing in the middle of the Hudson River?

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Those that live in the area and travel along Rt 9W, Rt 218, or Rt 9D see it every day. Most wonder, “what the heck is out there?” 

Those of us that live around here have heard all the stories about it. Some venture to go out there in rowboats or canoes; some make it, unfortunately, some never come back due to currents and other natural forces and they perish in the attempt to discover its secrets. 

What is it I am talking about? It goes by two nam...