The Stone Spheres of Costa Rica: Scattered across the Diquís Delta, these nearly perfect granite spheres, some over 2 meters in diameter and weighing tons, were crafted by the pre-Columbian Diquís culture (c. 600-1500 CE). Their purpose is unknown—possibly astronomical, social, or symbolic. The precision achieved in shaping hard stone using only stone tools demonstrates sophisticated stone-working techniques and significant communal organization for transportation and placement.
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