Angkor Wat...

"... is a Hindu temple complex at Angkor, Cambodia, built for the king Suryavarman II in the early 12th century as his state temple and part of his capital city. As the best-preserved temple at the site, it is the only one to have remained a significant religious centre since its foundation — first Hindu, dedicated to the god Vishnu, then Buddhist. The temple is the epitome of the high classical style of Khmer architecture. It has become a symbol of Cambodia, appearing on its national flag, and it is the country's prime attraction for visitors.

Angkor Wat combines two basic plans of Khmer temple architecture: the temple mountain and the later galleried temple, based on early South Indian Hindu architecture, with key features such as the Jagati. (...) The temple is admired for the grandeur and harmony of the architecture, its extensive bas-reliefs and for the numerous devatas (guardian spirits) adorning its walls.
The modern name, Angkor Wat, means "City Temple"; Angkor is a vernacular form of the word nokor which comes from the Sanskrit word नगर nagara meaning capital or city. wat is the Khmer word for temple.

Angkor Wat lies 5.5 km north of the modern town of Siem Reap, and a short distance south and slightly east of the previous capital, which was centred on the Baphuon. It is in an area of Cambodia where there is an important group of ancient structures.

Since the 1990s, Angkor Wat has seen continued conservation efforts and a massive increase in tourism. The temple is part of the Angkor World Heritage Site, established in 1992, which has provided some funding and has encouraged the Cambodian government to protect the site."

Text from: http://en.wikipedia.org/wiki/Angkor_Wat