Antikythera mechanism
The device was found on a shipwreck, near the island of Antikythera, between the Peloponnese and Crete. Different coins were also found on the wreck. There are coins from Pergamon, dating between 86 BC and 67 BC, and coins from Ephesus, dating between 70 BC and 60 BC. This means that the ship sunk between 70 and 60 BC. This device is the most complex device known in Antiquity. Only in the 14th century did people again have the knowledge to build similar devices.