I have visited ANGKOR WAT temple

Angkor Wat (Khmer: អង្គរវត្ត) is a temple complex at Angkor, Cambodia, built for the king Suryavarman II in the early 12th century as his state temple and 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. It is the world's largest religious building.^[1] The temple is at the top 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.

Cambodian Flag Meaning:
The blue color symbolizes the country's royalty. The red represents the nation and the white represents the religion, beginning with Brahmanism, and the current major religion - Buddhism. The emblem of the temple represents the structure of the universe.
Cambodian Flag History:
The Cambodian flag was adopted on June 30, 1993. It was originally adopted on October 29, 1948 and remained until October 1970. The Cambodian flag once again resurfaced in 1993 with the reestablishment of the Cambodian monarchy. Cambodia declared independence from France on November 9, 1953.
Interesting Cambodian Flag Facts:
The first Cambodian flag came into existence around 1863. It was quite similar to the Cambodian flag currently used.