2. Antikythera mechanism
This relic was found among the remains of an ancient Greek ship that perished nearly 2,000 years ago. It is a bronze device with a variety of gears and mechanisms that appear to be a component of some amazing innovation. It was believed for a long time to be an antiquated astrolabe, but upon closer examination, archaeologists discovered it to be much more than that. It is the most intricate historical discovery of its era since it is, in fact, an ancient astrological calendar. Scientists are still baffled by its operation and are working to find a solution.