Wat Phra That Doi Wao
Wat Phra That Doi Wao information
Lonely Planet review
Take the steps up the hill near the border to Wat Phra That Doi Wao for superb views over Mae Sai and Myanmar. This wát was reportedly constructed in memory of a couple of thousand Burmese soldiers who died fighting the KMT here in 1965 (you'll hear differing stories around town, including a version wherein the KMT are the heroes).