The Dropa Stones are a collection of ancient artifacts discovered in 1938 by a Chinese archeological team in the Bayan-Kara-Ula mountains of Tibet. The stones are composed of a unique type of grooved stone discs, each containing a spiral of hieroglyphs. The
From Wikipedia
The Dropa stones are purported set of 716 granite discs inscribed with unknown markings. These pseudoarcheological artifacts are claimed to be a series of 12,000-year old accounts of an extraterrestrial crash landing on Earth.