DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Inca wall. Stone wall built by the Incas without the use of mortar. The stones fit together with incredible precision, displaying the engineering skill and craftsmanship of the Incas. The Incas established an extensive empire in their native Andean regions of northern South America in the 15th and 16th centuries. Photographed in Peru.
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