The CBC reports that the prehistoric art in France’s Lascaux caves is being threatened by mold.
The French government has closed off the caverns entirely and to replace the air circulation system to try to save the drawings, estimated to be at least 15,000 years old. Historians believe hunter-gatherers drew the mineral-pigment paintings that include images of horses, bulls, birds and a rhinoceros.
The caves have been closed to the public since 1963, but wannabe spelunkers can explore a nearby replica of two of the Lascaux caves. Tourism ends up being a problem at a lot of attractions, both natural and art-based: Simply by being there, you’re altering what you came to see.