If you do a quick Wikipedia search, Parkour and Free Running look very similar. For those unfamiliar with either, both sum up to the activity of urban climbing and jumping. Both follow the same philosophy, where a person moves from point A to point B as efficiently as possible. This means anything from climbing a 10-foot wall to jumping over a 3-story drop.
The Human Spiderman:
In this video, from 2:00 the guy goes nuts climbing abandoned buildings. Really amazing.