Most Travel-Restricted Places in the World

Travel-ish |

Lascaux Caves (Dordogne region, France)

It would be pretty cool to explore these caves which are home to paintings that are an amazing 17,300 years old.  The cave system was discovered in 1940 by a teenaged boy. 8 years later, the caves were opened up to the public but in just 7 short years, the emissions and exposure to the elements caused the Paleolithic paintings serious damage. The caves were closed to the public in 1963.