Stone Spheres

There is a stone Sphere of Costa Rica near the Peabody museum at Harvard: the 4800 pound stone ball is believed to be from the year 600. The local name "Las Bolas (the balls) is a better description as the sphere is mathematically the surface of the ball. These stone sculptures are the icons of Coast Rica's cultural identity. The ball had been placed to the current location in 2014 Article: Secrets of the Diquis Ball after it had to make place to the new library in 2012. Click on the picture to see a larger version:
From this book: Hidden History: Lost Civilizations, Secret Knowledge, and Ancient Mysteries By Brian Haughton: