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A Prehistoric Cave

If you love to take your dog on big adventures to stretch their legs, there's a high chance that you don't head off into the forest. But that's exactly what four teenagers did in 1940. They took their dog to the Vezere River Valley in Montignanc, France, and what they found in the forest changed everything we thought we knew about the history of the world. That's because they stumbled across a prehistoric cave.

Lascaux painting via Wikimedia Commons

Now called the Lascaux Grotto, they discovered that this cave was covered in prehistoric cave drawings and markings that taught historians even more about this time in history. And it was a pretty big deal.