In Bangkok there is the Grand Palace with the temple of Wat Phra Kaew - "Temple of the Emerald Buddha".

An excerpt from the article 31 facts about Thailand

This palace served as the official residence of the King of Thailand from the 18th to the mid-20th century. Currently, the king's residence is located in the Chitralada Royal Villa.

The Grand Palace is located on the eastern bank of the Chao Phraya River, surrounded by a defensive wall of a total length of 1900 m. The entire palace complex covers an area of 218.400 square meters.