Naive art is unique to Croatia, and this is definitely a must see if you want a new experience. Take in the amazing colourful primitive folk art done on glass in reverse mode, mainly by artists with no formal training. This museum is worth seeking out in the Upper Town of Zagreb. There are very interesting paintings and some sculptures by untrained Croatian artists from rural areas. Most of the pieces were created in the period from the 1930s to the 1970s.