Tightrope Walkers Extraordinaire

Charles Blondin who crossed Niagara Falls in 1855 on an 1100-foot (336-meter) tightrope suspended 160 feet (48 meters) above the falls and five years later carried his agent across piggyback; in 1974 Philippe Petit crossed between the twin towers of the World Trade Center in New York on a tightwire 1350 feet (412 meters) above the city sidewalk