What's more intriguing than an abandoned island with a rotting castle sitting just north of New York City? Bannerman's Island sits in the Hudson, just about 50 miles north of here, and American Heritage explains "this island fortress was once the private arsenal of the world’s largest arms dealer," Frank "Francis" Bannerman. Living in Brooklyn at the time of the Civil War, he purchased "government surplus equipment at the nearby Brooklyn Navy Yard" for the......