Lascaux cave, France
The prehistoric paintings in the Lascaux cave were found in 1940, and it became a tourist site after World War II. The carbon monoxide from visitors’ breath started to damage the cave paintings, which are now named a UNESCO World Heritage Site, and the cave closed to the public in 1963. Replicas opened for business after it closed, but only preservationists and researchers are allowed in the original. Check out these 10 ancient mysteries that still can’t be explained.
Sign up here to get Reader’s Digest’s favourite stories straight to your inbox!