Antikythera Mechanism

Date Made: 150–100 BCE

Location Discovered: Shipwreck off Antikythera Island, Greece

Rough Size: Approx. 12 × 7 × 3 in (width × height × depth)

Materials: Bronze gears and mechanisms in wooden casing

Mystery: Ancient mechanical “computer” with precision gearing and astronomical functions unmatched for over a millennium.