located in Chiang Saen old town, was built by King Saen Phu, the 3rd ruler of the Lanna Kingdom in early 13th Century. Ancient sites include the bell-shaped, Lanna-style principal Chedi which measures 88 metres high with a base 24 metres wide, the largest such structure in Chiang Saen. There are also remains of ancient Wihan and Chedi.
- Wat Phra Chao Lan Thong
- The Chiang Saen National Museum