![10 Unexplained Archaeological Discoveries](https://hight3ch.com/wp-content/uploads/2016/03/10-unexplained-archaeological-di.jpg)
Occasionally, archaeologists unearth items that leave even leading experts completely stumped. From the Ancient Greek Antikythera Mechanism – known as the first ever computer – to the hundreds of mysterious stone spheres scattered across Costa Rica, Alltime10s brings you 10 of the most bizarre, perplexing discoveries from history.