Mysteries From Ancient Times That Still Defy Explanation

The Stone Spheres of Costa Rica

In the Diquis Delta of Costa Rica, ancient stone carvers carved hundreds of giant almost perfectly round spheres. Made of a type of igneous rock, some of the stones weigh as much as 16 tons and span over two meters in diameter. The spheres were lined up toward the home of the current chief, but nobody knows what the purpose of the rocks was. Wealthy landowners keep them in their gardens now, making it impossible to study them.