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I found this card, it is part of a set, A Series of 40 Unexplained Mysteries of the World. This one is card No. 3.
A Series of 40 Unexplained Mysteries of the World
No. 3
The mysterious giant granite spheres of Costa Rica were first studied in the 1940s by American archaeologist, Dr Samuel Lothrop, of Harvard University. They were originally found in the 1930s when a forest was cleared for a banana plantation. At least four centuries old, they range from a few centimetres in diameter to over two metres and weigh over 16 tonnes.
Many of them are almost perfectly smooth, obviously man-made by skilled artisans using templates. Who made the spheres, and why, remains an unsolved mystery.
Photograph: Tony Morrison
Continue reading Mysterious Stone Spheres of Costa Rica
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