Stone Spheres of Costa Rica

Photo by jared

(PCM) Stone Spheres of Isla de Caño, Costa Rica

What:
Over three hundred spheres of varying size (ranging from a few centimeters to 2 meters in diameter) scattered throughout the island. The largest weigh 30,000 pounds. Most are made of basalt (volcanic rock), but some are made of limestone or sandstone. They date back to approximately between 200 BC and 1500 AD, and the locals call them Las Bolas.

They were discovered …