The Antikythera Mechanism – that's the gears and stuff found in 1900
in a shipwreck from about 150-100 BC.

We'll start with the cool link with the pictures:
http://www.neatorama.com/2009/11/30/...-be-so-modern/
Scroll down, there's a video clip of the finished project.

and the 'home page' http://www.antikythera-mechanism.gr/

with links to radiographic scans, and other fun things.