When I was a kid I used to examine all the roofs in all the neighbouring buildings. We loved to climb high tower cranes. However, while I was able to reach only the cabin, a friend of mine avanced much higher, to the farther edge of the horizontal arm, to the wheel where the ropes hang. And he then climbed down by those ropes to the crane hook and sat on it for a while and after that he climed up and made all that way back to the cabin.

And we also used to race on beams or on the edges of walls at construction sites.

But now what's becoming more and more populare is this:

http://<a href="http://www.youtube.c... - YouTube</a>