Photo: Pueblo Bonito in Chaco Canyon

Pueblo Bonito, in Chaco canyon in Northwestern New Mexico, USA, is probably one of the most well-known and most impressive native american ruins in the area. Beyond the sheer scale of the buildings in the canyon, astronomical connections between the constructions and solar and lunar cycles are breathtaking, as exemplified by solar and what is believed to be lunar calendars tracking an 18.5 year cycle.

Chaco Canyon is believed to have been a place of great influence in the ancient native cultures. Archeological finds in the canyon point to communications reaching far south into what is modern Mexcio.