El Infiernito - Credit: Wikimedia Commons
El Infiernito (Spanish for "The Little Hell"), is a pre-Columbian archaeoastronomical site located on the Altiplano Cundiboyacense in the outskirts of Villa de Leyva, Boyacá, Colombia. It is composed of several earthworks surrounding a setting of menhirs (upright standing stones); several burial mounds are also present.(Spanish) Investigaciones Arqueológicas en Villa de Leiva. Edición original: 2005-05-13 Edición en la biblioteca virtual: 2005-05-13 Creator: Eliécer Silva Celis - Biblioteca Luis Ángel Arango The site was a center of religious ceremonies and spiritual purification rites, and also served as an astronomical observatory. Read more on Wikipedia
Source: en.wikipedia.org