Machu Picchu is an Incan citadel set high in the
Andes Mountains in Perú, above the Urubamba River valley. Built in the
15th century and later abandoned, it’s renowned for its
sophisticated dry-stone walls that fuse huge blocks without
the use of mortar, intriguing buildings that play on astronomical
alignments, and panoramic views. Its exact former use remains a mystery.
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