If you happen to have several days to spend on your own in Vientiane consider giving the Buddha Theme Park in Vientiane a visit. As the name suggests it's all about Buddha statues. Very interesting, especially if you are into Asian culture and history like me
Consider paying a guide to explain the story behind the statues, to get more out of your visit.
The Buddha Theme Park is located a little east of the city centre close to the Mekong river.