Chaco Canyon:
A cathedral of the american desert, built during the 12th century it was one of the largest pilgrimage sites in all of the Americas, its hundreds of kivas could house tens of thousands of worshipers. Initially it was believed to be a trading center until they couldn't find any evidence of household refuse, so they realized it must have been a ceremonial center. The walls of the buildings are lined up perfectled with the both the solstices and the equinox, and they are also the ONLY monuments in the world discoverd to be also aligned with the moon.
