Caracol (The Observatory) at Chichen Itza. Caracol (The Observatory) is suspected have been used by the Mayans to observe Venus's movements.

Sitting on the snakehead carvings at Chichen Itza.

Sitting on the snakehead carving at Chichen Itza.

A view of Caracol (The Obseratory) from the Nunnery at Chichen Itza.

The Complex of the Nuns, the title Nunnery is based on the Spaniards' impression of the building.

An East view of the Nunnery at Chichen Itza.

The Church of Chichen Itza next to the main Nunnery.

Fallen pillars at Chichen Itza.

Pyramid of Chichen Itza is a large pre-Columbian archaeological site in Yucatan, Mexico built by the Mayan civilization.

Sitting in the ruins of ancient Mexican ruins at Chichen Itza.

Tzompantli or "skull platform" associated with the Toltec culture. This structure was most likely used for the storage of heads of captives or sacrificial victims.

Stone carving at one of Mexico's ancient ruins at Chichen Itza.