Other bodies, though, retain their skin and internal organs. The Tollund Man, for example, still had his leathery skin intact when he was found in the Bjaeldskovdal bog in Denmark and is considered by some to be the most well-preserved body ever found from prehistoric times. He was so well-presevered that the men who found him thought they had stumbled upon a modern murder scene, PBS reported. He was actually about 2,400 years old.