The structure, situated on a ridge overlooking the Utcubamba Valley in northern Peru, is roughly 600 meters in length and 110 meters in width. It was likely built to defend against the Huari or other hostile peoples. Radiocarbon dating samples show that the structures construction started in the 6th century AD and occupied until the Early Colonial period (1532-1570).
There are kombis daily & taxis from Chachapoyas to Kuelap. Most leave from their respective stations 2 to 3 blocks from the main square.
3 hours walk or 30 minutes driving from nearest hotels in the hamlet of Santa Maria. Most cost 20-30 Sol. Hot water is not always available but food is plentiful, cheap and tasty in that hamlet.
Ticket is 15 Sol as of April 2014, but guides are now obligatory and cost anywhere from 5-20 per person in Spanish. Be careful not to walk too far without securing the guide, because it is 20-30 minutes from ticket counter to the main wall uphill, and you will be turned back without a guide.