Museum of Naive Art
The site has still has prices in Lats (LVL), pages are not updated since long long time ago, but in any case it stays as it is as a nice souvenir to old times.
Update October 2'nd 2013:
The Museum of Naive Art moved to AB Dambis
The Museum of Naive Art is located in Andrejsala.
What is Naive art? basically a creation of an artist who did not study Art.
Important update: unfortunately the structure of the Naive Art Museum is going to be demolished, together with some other old buildings that are located in Andrejsala.