...Is right outside of Woodstock, New York. (Of course.) We might should not have gone out of our way for this, but we did :). My fancy-shmancy Roadside America iphone app indicated that this was the closest, most interesting thing to see on our trip home from Troy, NY (though I was torn between this and Queen Victoria's Friction Tube (wtf) which is also an exit away from I-88. It's a little bit cooler to be watching this lying on your back and looking up to the top of an old silo. (Not much though.)