walking on the edge

I used to jump out of perfectly good airplanes when I was in the Army, so the height thing isn't that big a deal. the $175 is, so, I'll pass.
They had something like that here in Cincy for awhile. You paid to walk on the upper structure of a bridge across the Ohio River. That the was the thing to do, for about 6 months, then everyone who was going to pay to do it, did it and that was that.