High-wire artist Nik Wallenda announced late last week that he would walk over Niagara Falls with no safety harness on June 15. Wallenda will cross a two-inch wide 1,800-foot-long cable strung roughly 200 feet above the bottom of the gorge. The seventh generaton performer spent the last two years working to get the permits and exceptions needed to perform the once-in-a-generation Niagara Falls stunt.
Wallenda grew up in a renowned aerial acrobatics family known as "The Flying Wallendas." Here's a quick video history of some of the family's feats.