The property includes four archaeological sites located in the Diquís Delta in southern Costa Rica, which are considered unique ... most significantly, a collection of stone spheres, between 0.7 m and ...

Costa Rica boasts not one, but four United Nations Educational, Scientific, and Cultural Organization (UNESCO) locations.

Here are the 15 most unexplained ancient artifacts. Related: Rare Artifacts from the Ancient Egyptian Era In Costa Rica, stone spheres are located on the Diquis Delta and on Isla del Cano ...

Sebenius, James K., and Hannah Bowles. "Case Brief: Stone Container in Honduras and Costa Rica." Harvard Business School Case 800-137, October 1999. (Revised June 2002.) ...

recently returned from a trip to Costa Rica where he and colleagues evaluated ancient stone spheres for UNESCO, the United Nations cultural organization that might grant the spheres World Heritage ...