Wat Ming Muang
This small temple just a block or two from Wat Phra Kaew is among one of the oldest in Chiang Rai, apparently dating to the city's founding. That said, there isn't much of interest here, although the decorations on the chapel are quite fanciful. A new, larger, prayer hall was under construction when I last visited in 2012, as well as another building, so the temple seems to be in the midst of a major upgrade.
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Within sight of the front entrance to the temple is a large new mosque, with minarets sporting rather Chinese features.