Well, if you Americans are prepared to look across your own borders (I know most of you do so only very reluctantly) you can't really beat the Masoala hall in Zürich Zoo, Switzerland, and the general "jungle feeling" that it creates. Burgers Bush is also very good but Masoala just seems to be a bit more "wild" and jungle-like. I have seen many good tropical houses but those are so far the only two that actually make you feel similar to being in a rainforest. I have yet to see Gondwanaland in Leipzig.
As an American who enthusiastically "looks across our own borders" (enough with the stereotyping, please!), I agree that both Masoala and Burger's are among the very best indoor rain forests anywhere. Gondwanaland is also spectacular, but I was a little disappointed by the vast amount of not-very-good artificial rock and trees, and the poorly-disguised barriers in some of the exhibits. In a few years when the vegetation has really grown in, however, it will be unbelievable (in a good way). Curious to see Randers rainforest, which though smaller seems from photos to have a very nice feel.
Has anybody visited any in Asia or other parts of the world? I know that Singapore and some of the Australian zoos have the distinct advantage of having genuine non-outdoor rainforests.
I can only think of one enclosed rainforest building I've seen in Australia and that is the butterfly house at Melbourne Zoo. I guess we really don't need it. Even in Melbourne, where it does get a little bit cold in winter, all of the tropical species can be kept outside year round.
