日坛
The Temple of the Sun is the most significant building whose partial ruins survive at the archeological site. It is constructed in the Inca way without mortar, as are most of the structures in the complex. The stones were carefully chiseled and fashioned to fit together perfectly. It was positioned in keeping with their beliefs and knowledge of the cosmos. Researchers have learned by observation that the Temple of the Sun was positioned so that on the solstices, at exactly the right time of day, sunlight would fall through the center of the doorway of the small chamber at the top of the temple. Most of this chamber has fallen down.