Wikipedia
Catequilla
Monte Catequilla (also Kati-Killa) is an archaeological site in the Pomasqui Valley of Ecuador. Located in the Parish of San Antonio of Quito Canton in Pichincha Province, it has an elevation of . Attributed to the Pre-Columbian era Quitu- Cara culture, it was presumably used as an astronomical observatory even before the arrival of the Incas, and is the only prehispanic site in the Americas that is located precisely at the Earth's Equator.