The Dropa Stones are a mysterious set of ancient artifacts discovered in 1938 in the remote mountains of Tibet. The stones, which are believed to be around 12,000 years old, are inscribed with an unknown script that has yet to be deciphered. For
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.