Ulm

Ulm, Germany, was interesting as it had the tallest climbable steeple in the world (161.53m high and 768 steps). I think it was 470+ feet of stairs. Just when you thought it couldn't go on, there were more steps to be found. I thought I was at the end at least a couple of times. By the time you do actually get to the top it is pretty freaky with about a 3 metre radius on the top platform.