Sure of foot
Turns out one of the guys I went to Red Rocks with is into Buildering; which is urban climbing. Sometimes with rope and gear, and sometimes (mostly…it seems to me) without anything. It intersects with the sports of climbing, parkour and urban exploring and seems to take a lot of shapes worldwide.
I love this site he posted ontheroofs.com. Two russian guys with the most spectacular photos, particularly of china. Its a breathtaking series that scares the shit out of you, and also begs you to oggle architecture from a completely new and staggering viewpoint.