Angkor Wat, located in Siem Reap Province in Cambodia, amid forests and farmland to the north of the Great Lake (Tonlé Sap) and south of the Kulen Hills, is a quite phenomenal temple complex started in the 12th century by the ruler Suryavarman II (1113 – c. 1150), and is today a World Heritage Site. One of the most impressive builds in human history, the Angkor Wat Temple used more stone (6-10m sandstone blocks at an average of 1.5 tons each) than all of the Great Pyramids of Egypt combined, and covers an area greater than Paris does today. Almost every surface in the temple is adorned with carvings, a gallery wall alone being decorated with almost 1,000 square metres of bas-reliefs.
Angkor, the ruined city in Cambodia, once stood as the capital of the ancient civilisation of the Khmer Empire, which was ascendant from the 9th to the 15th centuries. It grew so large and powerful that during the years 1010-1220, fully 0.1% of the population of the whole world actually lived within its boundaries. 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, said to be the world’s largest single religious monument.
In 2007, an international team of researchers using satellite photographs and other modern techniques concluded that Angkor had been the largest pre-industrial city in the world, with an elaborate infrastructure system connecting an urban sprawl of at least 1,000 square kilometres (390 sq mi) to the well-known temples at its core. It was the site of vast cities that served all the needs of the Khmer people. Aside from a few old bridges, however, all of the remaining monuments are religious edifices. In Angkorian times, all non-religious buildings, including the residence of the king himself, were constructed of perishable materials, such as wood, “because only the gods had a right to residences made of stone.”(Source: Wikipedia)