Angkor is a name conventionally applied to the region of Cambodia serving as the seat of the Khmer empire that flourished from approximately the 9th century to the 15th century A.D. In 2007 an international team of researchers using satellite photographs and other modern techniques concluded that Angkor had been the largest preindustrial city in the world with an urban sprawl of 1,150 square miles.

The temples of the Angkor area number over one thousand, ranging in scale from nondescript piles of brick rubble scattered through rice fields to the magnificent Angkor Wat. Many of the temples at Angkor have been restored, and together they comprise the most significant site of Khmer architecture.