Marcahuamachuco, Archaeological complex in Huamachuco District, Peru

Marcahuamachuco sits on an isolated highland mesa about 5 km long and 500 m wide, 3 km northwest of Huamachuco at 3,575 m. Its compounds are enclosed by curved stone walls up to 12 m high, with multi-storied gallery residences, inner rooms and plazas. On the slope, low broken walls form rectangular enclosures and passages, and a long wall is topped with evenly spaced upright stone slabs.

Construction began around AD 400 and continued to about AD 800, before the Wari expansion and the Inca conquest of the 14th century. The site was northern Peru's main political, economic and military centre, with an oracle cult linked to Ataujo and Catequil. John and Theresa Lange Topic suggested occupation was seasonal, with up to 6,000 people; the site was likely abandoned in the 15th century.

Marcahuamachuco was an oracle centre whose cult was tied to the deity Ataujo and, later, to Catequil, drawing pilgrims from the northern Andes in present-day Peru and Ecuador. Its influence reached the Mochica to the west, Recuay to the south and Cajamarca to the north, partly through trade between AD 650 and 700. In its later stages the enclosure walls held burials of the elite.

The site is open daily and requires good physical preparation because of the high altitude and uneven terrain. Bring warm clothing and plenty of water, as the mountain climate is cold and there is little shade.

The site's curved stone walls reached up to 12 metres high, enclosing compounds with inner galleries, rooms and plazas. Archaeologists John and Theresa Lange Topic (1991) estimated a seasonal population of up to 6,000, based on the arable land and water available on the mesa.