In 1938, Dr. Chi Pu Tei looked at the Bayan-Kara-Ula mountains in China and thought to himself 'they've never been explored, I wonder what's inside them?' The reward for his curiosity was the discovery of the Dropa Stones.
With their central holes and carefully-etched grooves, they look a little bit like stone versions of vinyl records. In each of the grooves is a series of tiny hieroglyphs, and so they might be historical records. To add to their general air of mystery, they've gone missing since their discovery!