|Left as found on the bottom of the Mediterranean - Right a 3D model made from what remains|
Above is the Antikythera mechanism, a fully analog "computer" thought to have been designed and constructed at around 150 BC. Its believed to be able to map and predict several different astronomical events such as eclipses to a level of accuracy that wouldn't re-exist over 1500 years later...
NERD ALERT (did I just do that to myself?)
Anyway its really cool and less boring than I'm making it sound, click below...
|"I hope there is less than 3oz of seawater in there"|
Source -> http://io9.com/5713049/advanced-imaging-reveals-a-computer-1500-years-ahead-of-its-time