Though Angkor Wat is the largest of the Angkor temples, 12th century Angkor Thom is the most dramatic. Covering close to 4 square miles, Angkor Thom – literal translation: the Great City – was the last and most enduring capital city of the Khmer empire. Encircled by 25-foot tall walls and flanked by a moat, there are gates at each of the four cardinal points, from which roads lead to the striking Bayon temple at the center of the city.