When I was a kid, me and my friends would climb a local water tower that was about a hundred feet up. When we got to top, we would walk around the perimeter of the dome without any fear, and then just kick back and watch the stars for a while. Of course, we were young and stupid. I drive by that same tower almost daily now and sometimes I think back at what a foolish thing I did.
But 1800 feet? no thanks. Like the other poster said, you have to be a bit out of your mind.