Two mysterious polished stone balls thought to date around 5,500 years have been discovered in a tomb on Sanday, in Scotland's Orkney Islands. Pictured: the first stone ball recovered from the ...

Hugo Anderson-Whymark, a senior curator of prehistory at National Museums of Scotland, is on site. His posts about the polished stone balls on social media have gained much attention from those in ...

15. Stone Spheres In Costa Rica, stone spheres are located on the Diquis Delta and on Isla del Cano, and are one of the most interesting ancient artifacts.

Art Under the Sun: Artist Alicja Kwade's nine massive carved and polished stone spheres, representing the planets, appear to float among intersecting steel frames amid the skyline of Manhattan ...