Machu Picchu sits at 2,430 metres above sea level on a narrow ridge above the Urubamba River in the Peruvian Andes, invisible from below, hidden from the Spanish conquistadors who never found it. Built around 1450 CE by the Inca emperor Pachacuti, abandoned around 1572 CE, and brought to international attention by Hiram Bingham in 1911, it is arguably the most dramatically situated archaeological site in the world — and one of the most precisely constructed.
The current consensus is that Machu Picchu served primarily as a royal estate for the Inca emperor Pachacuti — a mountain retreat combining a palace, agricultural terraces, temples, and accommodation for the permanent staff who maintained the site. It was not a fortress (it has no defensive walls) and was not a city in the urban sense (its permanent population was probably only a few hundred people).
But it was also emphatically a sacred site. The Intihuatana — the carved stone pillar whose name means "hitching post of the sun" — was the central ritual object, used in ceremonies to symbolically bind the sun at the winter solstice and ensure its return. At both equinoxes, the sun sits directly above the pillar casting no shadow at midday. The Temple of the Sun, a curved tower built over a natural cave, has windows precisely aligned to the June solstice sunrise. The Temple of the Three Windows faces the rising sun on specific significant dates.
The Inca understood the landscape itself as sacred — every mountain peak (apu) was a deity, the rivers were living forces, and the site at Machu Picchu was chosen to sit at the intersection of multiple sacred sight lines connecting significant mountain apus. The citadel is not imposed on the landscape but aligned with it, participating in a geography of sacred relationships that extended across the Andes.
The Inca did not build in spite of the landscape. They built with it — every stone placed in conversation with the mountains, the river, the sky. Machu Picchu is not a structure in a landscape. It is part of the landscape's conversation with itself.
— Johan Reinhard, Machu Picchu: Exploring an Ancient Sacred CenterMachu Picchu's stonework is among the finest in the ancient world. The Inca used a technique called ashlar — cutting stones with such precision that they fit together without mortar, the irregular polygonal joints interlocking to create structures of extraordinary stability. In a seismically active zone, the mortarless construction is an advantage: the stones flex slightly during earthquakes rather than cracking under rigid mortar stress.