2. Easter Island, Chile
The giant rock heads of Rapa Nui are another confounding conundrum that brings visitors to the remote island off the Chilean coast. 887 50ft tall moai, as they’re called, have been found, the lightest of which weighs a whopping 86 tons. More than just heads, excavations have revealed that most of these monolithic effigies are actually attached to stone bodies buried beneath the soil. Not all the statues are proudly perched like sentinels on the cliff. Many are lying unfinished and abandoned in quarries and some have hieroglyphic writing on them which adds to the intrigue. How were they built? Why were they built? Who exactly built them? Hypotheses are plenty, but no one really knows.