There's a hill in the middle of Luang Prabang called Phu Si. Up top of Phu Si you get a fairly good view of the city, a Wat, and ... an old Russian anti-aircraft gun base. It spins freely, and so it's popular with the kids.
Part of a boat that I saw on the trip down the Mekong.
Wat Xieng Thong is heavily decorated with mirror tile, but they've lost some of it with the years.