The Phaestos Disc is a disk of fired clay from the Minoan palace of Phaistos on the island of Crete. The approximate dating is the middle or late Minoan Bronze Age (200 BC). It is about 6 inches in diameter and covered on both sides with a spiral of stamped symbols. Its purpose and meaning are a mystery and make it one of the most famous mysteries of archaeology. This unique artifact is now on display at the archaeological museum of Heraklion.