Here is the insane part: the Antikythera Mechanism has been dated to the 2nd century B.C.! It would take the scientific revolution and almost two thousand years for technology to get this good again...
Anyway, Apple software engineer Andy Carol recently reconstructed the Antikythera Mechanism with one of the most sophisticated construction systems ever created: Legos :)
And for those of you who paid attention to the Ada Lovelace entry, here is a Babbage Difference Engine, also made of legos:
The next challenge is to build a machine with Jenga pieces :)