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Machu Picchu is an Incan citadel set high in the Andes Mountains in Peru, 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.

Ollantaytambo is a village in the Sacred Valley of south Peru, set on the Urubamba River amid snow-capped mountains. It's known for the Ollantaytambo ruins, a massive Inca fortress with large stone terraces on a hillside. Major sites within the complex include the huge Sun Temple and the Princess Baths fountain. The village's old town is an Inca-era grid of cobblestoned streets and adobe buildings.

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