Lascaux Cave, France
Lascaux Cave is located in southeastern France and contains 900 examples of prehistoric art, incredibly well preserved today, thanks to the unique conditions of air circulation in this underground system.
Today, the object is considered one of the most important Paleolithic monuments in history and is called the “Sistine Chapel of Primitive Painting.”
Since 1963, it is forbidden to enter these caves because due to tourists a fungus has reached them, damaging Lasko’s unique ecosystem.
Any human intervention is considered to be potentially destructive to the cave and its contents. So now it is literally locked and every 2 weeks a special team goes there with protective clothes and manually cleans the walls of irritating fungi.