Observatory building (El Caracol), Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

chichen itza mayan ruins observatory yucatan mexico ancient stone structure wall building architecture history culture civilization archaeology travel tourism vacation destination landmark monument heritage pyramid temple ruins site sun sky blue grass green archaeological site mesoamerica mayan culture ancient astronomy mayan calendar yucatan peninsula mayan architecture south america mayan history