An ancient Greek analogue computer used to predict astronomical positions and eclipses for calendar and astrological purposes decades in advance.
A submerged rock formation off the coast of Yonaguni, the southernmost of the Ryukyu Islands, in Japan
The stone spheres of Costa Rica are an assortment of over three hundred petrospheres in Costa Rica, located on the Diquís Delta and on Isla del Caño.
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