Universeum in Göteborg (Gothenburg) is a National Science Centre in Sweden, with exhibitions on physics, chemistry, space etc. But it also has a lot of nice zoological exhibits! It is a very exciting house, built on the slopes of a mountain and designed by the most well-known contemporary Swedish architect Gert Wingårdh.
In the basement floor (where there are toilets etc), and before you buy your ticket and watch all the main attractions, you can enjoy an anaconda exhibit!
I spotted three or four of the big snakes.
August 2009