Human made massive stone spheres are found in the south of Costa Rica, in the Diquís Valley and on the foothills of the Osa Peninsula. Ranging in size from a few centimeters to over two meters and weighing tons, these spheres remain one of the centuries old unsolved archaeological puzzles.
Mostly made of hard volcanic rocks called gabbro or of limestone, the most striking aspect of these spheres is that they were produced during a period when metal tools did not exist. Bearing no hammer marks, these stones were shaped into perfect circles by being abraded with stone tools, sand, and water.
Archaeological excavations and carbon dating indicate that the creation of the spheres began around the 600s AD. Their most intensive period of production is estimated to be between 1000 and 1500 AD. It is known that they were made by the indigenous Diquís culture and pre Columbian tribes that once lived in the region.
The only thing still not fully resolved is what purpose they served. The most common hypothesis is that they were possessions placed in front of tribal chiefs' doors to symbolize power and status. Some researchers, on the other hand, argue that the spheres could be ancient maps or compasses pointing to constellations in the sky.
Included in the UNESCO World Heritage List thanks to their unique historical and cultural value, these stone assemblages stand as some of the finest remnants of past advanced stonework and geometric knowledge left to the present day.

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