Daredevils have been entertaining people for hundreds of years with their various demonstrations of bravery and courage. One of the oldest of these traditions is tightrope walking, which dates back a number of centuries and was a common act in travelling circuses. Over the years, the very best tightrope walkers have always pushed each other to take things to the next extreme and this has led to some incredible acts. Whether it’s a harness-less wire-walk across Yosemite National Park or a nerve-trembling skywalk between the Twin Towers in New York, the following are 5 of the craziest tightrope walks (and cycles) ever attempted.