Wat Phra That Chedi Luang

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.