Case file · High strangeness
Stone spheres of the Diquís delta, Costa Rica
Hundreds of near-perfect granite and gabbro spheres, up to 2.6 metres across, were uncovered while clearing banana land in southern Costa Rica in the 1930s; archaeologist Doris Stone first described them in 1943.
1943 CE · 8.95, -83.47 · status: explained
The account
They were made by the Diquís culture, mostly between AD 500 and 1500, and placed in lines and groups at settlements. Four sites were made a UNESCO World Heritage Site in 2014.
The sceptical view
Claims that they are lost-Atlantis relics or star maps have no support; they were shaped by pecking and grinding, and many were damaged or moved by treasure hunters.