Folklore holds that death by treachery, particularly if it is followed by improper burial rites or no rites at all (or if proper--and usually evil--burial rites are used, in some cultures), can cause a dead person to rise again to walk the night. The exact nature of the walking dead varies by culture; zombies, vampires, ghosts, and other undead creatures are purported to roam the night from New Orleans to London, and beyond. One of the less well known variations on the theme of unquiet corpses hails from Scandinavia, where a strange creature known as the draugr.