The unfinished structures at the Temple Hill and the numerous stone blocks that litter the site indicate that it was still undergoing construction at the time of its abandonment. Some of the blocks show evidence of having been removed from finished walls, which provides evidence that a major remodeling effort was also underway. Which event halted construction at the Temple Hill is unknown; likely candidates include the war of succession between Huáscar and Atahualpa, the Spanish Conquest of Peru, and the retreat of Manco Inca from Ollantaytambo to Vilcabamba. However it is also theorised that they are the work of the earlier Tiwanaku culture.