Kuélap is the most important archaeological site in northern Peru — a massive walled citadel built by the Chachapoyas civilisation on a mountain ridge at 3,000 metres, containing over 400 circular stone buildings within walls that reach 20 metres high. The site covers six hectares and was likely home to thousands of people at its peak between 900 and 1500 AD.
Access is by a cable car from the valley floor (opened 2017), which reduces the journey from a multi-hour climb to a 20-minute ride. From the cable car station, a further walk of about 20 minutes reaches the main entrance. Allow 2–3 hours to explore the site properly. The Chachapoyas architectural style — circular houses with stone friezes, set within massive enclosure walls — is unlike anything else in Andean archaeology. Bring a jacket; the ridge is exposed and often in cloud.