First of all it must be noticed that it is not a fortress but a city, a urban centre of the Chachapoyas peoples. THe great wall that surounds it is kind of an enormous terrace that holds the city on top constructed.
Although you can only go on organised guided tours, the experience is worthy as it is surrounded by awesome landscapes and it is a fascinating archeological site. The place is mysterious and makes you wander about this civilization, how did they live and the great achievements they made for the advances they had. I found very impressive the city "walls". It definitively lacks a little museum-building with more detailed information.
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