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.