This is a very interesting story. It's a BBC documentary. I found a really great site about this last night but of course, can't find it today!
Part 1
http://www.youtube.com/watch?v=WzfPC...eature=related
Part 2
http://www.youtube.com/watch?v=xjiDG...eature=related
Part 3
http://www.youtube.com/watch?v=k3dGO...eature=related
Part 4
http://www.youtube.com/watch?v=zgOSU...eature=related
On the 3rd video, look at the guardrail beside the girls at 8 seconds. What the hell is that?