Using today’s sophisticated technology, archaeologists have determined some purposes of the Antikythera Mechanism, an ancient analog computer built around 140 B.C. Since its discovery by sponge divers in 1901, scientists have puzzled over the mechanism. Despite its astounding sophistication, no similar device has ever been found, and the timekeeping technology it contains was not “re-discovered” until at least the 15th century.
Check out my post on the Antikythera Mechanism on my Ancient Tides blog. Plus, Nature.com has just posted a fascinating online video detailing the most recent research and its findings. If you're interested in ancient history or technology, the video is worth viewing. It runs about 10 minutes or so.