Bannerman’s castle – now in ruins – on Pollepel Island in the middle of the Hudson River, just north of Cold Spring. Looks impressive, but was never more than a very fancy military surplus warehouse (although a smaller structure was used as a residence).
It’s quite hard to get close enough to take a picture. The metro north train lines get in the way. The last picture was taken from a metro north train on a separate occasion. There is an overlook, but it’s quite hard to find and even when you do (as I did) the views are not particularly good. I imagine that the you would get the best pictures from a boat, which unfortunately I don’t possess. There are tours to the island, but they finish at the end of October so I don’t see me going this year.