Chac Mool in foreground and the Pyramid of Kukulcan (El Castillo), Chichen Itza, UNESCO World Heritage Site, Mexico, North America

The Pyramid of Kukulcan (El Castillo), Chichen Itza, UNESCO World Heritage Site, Mexico, North America

Spring equinox shadow on side of steps of the Pyramid of Kukulcan (El Castillo), Chichen Itza, UNESCO World Heritage Site, Mexico, North America

The Pyramid of Kukulcan (El Castillo), Chichen Itza, UNESCO World Heritage Site, Mexico, North America

Tourists climbing the Pyramid of Kukulcan (El Castillo), Chichen Itza, UNESCO World Heritage Site, Mexico, North America

Tourists descending the Pyramid of Kukulcan (El Castillo), Chichen Itza, UNESCO World Heritage Site, Mexico, North America

The Pyramid of Kukulcan (El Castillo) illuminated at night, Chichen Itza, UNESCO World Heritage Site, Mexico, North America

Temple of Ramses II at night, Abu Simbel, UNESCO World Heritage Site, Aswan, Egypt, North Africa, Africa