Genghis Khan was one of the world's most successful conquerors, and his empire left an indelible mark across Eurasia. Yet upon his death his body was spirited away to an unmarked grave, and everyone associated with the burial -- so far as we know -- was put to death in an effort to keep the location secret. So what exactly happened to Genghis Khan? Could it be possible that someone actually knows where it is, and has somehow kept the location hidden for almost 800 years?