The World Trade Center Tightrope Dance.

Philipe Petit didn’t realize that going to the dentist in 1968 would change his life. But, after seeing an article about the construction of the new World Trade Center towers in New York City, Petit became obsessed. After spending six years planning and researching, Petit decided the time was right to string a 140 foot steel cable between the “Twin Towers” (1,368 feet of the ground mind you) and step off the ledge. He spent 45 minutes on the wire, crossing between the towers 8 times. The police were dispatched to arrest him as soon as they realized what was going on, but Petit continued to enjoy himself on his wire until the threat of a helicopter plucking him off the wire (and rain) helped him end his tightrope dance. He was taken into custody and the incident is still referred to as the “artistic crime of the century”.

Wikipedia: http://en.wikipedia.org/wiki/Philippe_Petit