"An important global series on the world's most popular World Heritage sites, designed to help protect world culture and natural diversity, broaden our world heritage to better reflect the full spectrum of our world's culture and national treasures, and to provide a comprehensive framework and operational methodology"--Publisher's website. Situated at the heart of the Khmer Kingdom that ruled over the Indochina Peninsula from the 9th Century to the 15th Century, Angkor is dotted with the ruins of hundreds of stone temples, city walls, etc. Among these ruins, the stone temple Angkor Wat, and the royal city Angkor Thom, are the largest in scale and are valuable in terms of artistic merit. The Mogao Caves, [Dunhuang Caves] located in China's Gansu Province are arranged over a span of about 1600 meters in a cliff face that stretches north to south. This series of 492 caves with Buddhist wall murals and statues make up the largest cave-temple complex in the world.