A 3,600-year-old clay disc is stamped with a script nobody can read

Discovered in Crete in 1908, the Phaistos Disc is stamped on both sides with 241 symbols arranged in a spiral, made using individual carved stamps, an extraordinary technique for the Bronze Age. No other object uses the same symbols, and despite a century of attempted decipherments, no one has convincingly cracked what it says or even confirmed what language it records.

— Wikipedia contributors, Phaistos Disc — Discovered 1908, Crete