The stone spheres in Costa Rica are gigantic balls which are made entirely out of stone. The stone spheres can be found in two locations, the Diquís Delta and Isla del Caño. Between the two islands, there are over three hundred spheres. Each of the spheres weighs around thirty thousand pounds. Historians believe they could date back as far as the year 600. Who made them and what happened to the creators is still a mystery today.