The Khmer civilization, which flourished from the 9th to the 15th centuries, was centered in what is now Cambodia. It is best known for its impressive architectural achievements, particularly the construction of the magnificent temple complex at Angkor Wat. This site reflects the civilization's advanced engineering skills and deep spiritual beliefs, primarily influenced by Hinduism and later Buddhism. The Khmer Empire was a powerful political entity that expanded its influence across Southeast Asia. It developed a sophisticated society with a rich culture, including art, literature, and trade. The decline of the Khmer civilization began in the 15th century, leading to the eventual abandonment of many of its cities, including Angkor.