As Nik Wallenda prepares for his tightrope walk across Niagara Falls, look back at other wild stunts through history.
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Buried Alive -- Illusionist David Blaine isn't called the modern day Houdini for nothing. In 1999, he entombed himself in an underground plastic box underneath a 3-ton water-filled tank for seven days. It's a feat Houdini had planned, but died before attempting.