* Astronomy

The fortress of Kuelap (or Cuélap), associated with the Chachapoyas culture, consists of massive exterior stone walls containing more than four hundred buildings. 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 could have been built to defend against the Huari or other hostile peoples however evidence of these hostile groups at the site is minimal. Radiocarbon dating samples show that the structures construction started in the 6th century AD and occupied until the Early Colonial period (1532-1570), however through the pre-Columbian, conquest and colonial periods we have only the four brief references to Kuelap.
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