PASQUALE SORRENTINO / SCIENCE PHOTO LIBRARY PASQUALE SORRENTINO / SCIENCE PHOTO LIBRARY
Marker stone at Caral. Caral is a sacred city located in Peru. This vertical stone was used either as a sun-dial, or as an equi-distant point between two pyramids, one of which is seen in the background. Caral, located in Peru's coastal desert region, was one of the centres of the Caral Supe civilisation, a pre-Hispanic culture dating from the period 3000-1600 BC. The site was discovered in 1905, but it was not until 2001 that it was realised that it was up to 5000 years old, making it the earliest known South American civilisation. The Caral site includes the remains of pyramids, temples, houses, and an amphitheatre.
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