Sitting on the snakehead carving at Chichen Itza.

Sitting on the snakehead carvings at Chichen Itza.

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

The Nunnery Quadrangle, from the northwestern corner, featuring Puuc style architecture.

West of the Great Pyramid of Uxmal is the Pigeon House Cluster.

View of Pyramid of the Sun at Teotihuacan from base.

Detail from the Temple of the Feathered Serpent at Teotihuacan.

Detail from the Temple of the Feathered Serpent at Teotihuacan.

Pyramid of the Sun at Teotihuacan.

Black and white photograph of a Robert H. Merrill standing in front of the Fiesole Roman Bath.

Black and white photograph of the Roman Forum, taken from Palatine Hill. Buildings are visible in the distance, with ruins in the foreground

Black and white photograph of the Vesta restoration site. The image depicts ruins with buildings in the background.