Image Source: CIA - The World Fact Book
Angkor Wat (Angkorvat) Temple Complex in Cambodia built by Suryavarman II of the Khmer Empire during the 12th Century CE, is the world’s largest religious building. The Angkorvat temple is dedicated to Lord Vishnu and its architecture has been designed to represent Mount Meru.
The temple is built based on the early southern Indian Hindu architecture with features like Jagati. The Angkorvat temple is one of the key tourist attractions of Cambodia and also appears on the national flag of Cambodia.
The original name of Angkor Vat was Preah Pisnulok derived from Vara Vishnuloka in Sanskrit, which was a title given to the founder of this marvelous structure, Suryavarman II.
Source: Wikipedia