Jimmy Hoffa/Giants Stadium
Explanation: When Teamsters union boss Jimmy Hoffa disappeared without a trace from a Michigan parking lot in July 1975, rumors about what could've happened to him immediately surfaced. Hoffa legends abound, including one that describes his body being dumped in a Florida swamp and another that has him interred in a Vegas strip club. MythBusters Jamie Hyneman and Adam Savage investigated the Hoffa hypothesis nearest and dearest to residents of Newark, N.J., which suggests that the body was laid to rest beneath Giants Stadium.
The Giants Stadium myth stems from an FBI tip that the Hoffa henchmen buried him in concrete during the 1974 to 1976 construction of the pigskin palace (not to be confused with the New Meadowlands Stadium, completed in 2010). An unexplained bump on the 10-yard line has further fueled the Hoffa folklore.
To "see" underground, the MythBusters probed around with ground-penetrating radar, which can detect changes in soil properties and cavities. However, a thorough scan of the stadium, including that baffling bump, turned up no subterranean abnormalities.
The only thing the MythBusters could lay to rest was the busted Giants Stadium myth. For now, Jimmy Hoffa's remains are still at large.