Wari culture
The major urban centers, such as the great fortress of Kuelap, with more than four hundred interior buildings and massive exterior stone walls reaching upwards of in height, and Gran Pajatén possibly served to defend against the Wari culture around 800, a Middle Horizon culture that covered much of the coast and highlands. Referred to as the 'Machu Picchu of the north,' Kuélap receives few visitors due to its remote location.