Wat Muen San is the “less cool” version of the temple posted below.

Fun Fact: During World War Two, Japanese troops occupied Thailand and thus also Chiang Mai. In 1944 though Allied forces defeated the Japanese, they retreated through Burma to Thailand. One of the routes of retreat ended in Chiang Mai. The compound of Wat Muen San became a Japanese field hospital to take care of wounded soldiers.

The red building is some sort of Thailand-China significance, though not sure what exactly.