Wat Chokmkao Manilat is the main temple in Houei Xai. Built in 1880 it is a Shan style wat In 2013 it looked like this
with this view down the steps to the Mekong
In August 2015 they've done quite a bit more work on the place
check it out sometime it is worth the hike up the steps for the view , or you can ride up around the back on the concrete road.