At the moment Butterflies are "big business" and next to the general zoo loads of Butterfly houses, halls and farms can be found in many - mainly western - countries. I myself has already visited quite a number of them but would be intrested to know what you think is the best Butterfly display. Mine own Top 5 being : X-caret - Mexico Huge hall with a wide range of species Amazonica Rotterdam Zoo Beautifull tropical hall Emmen Zoo Tropical hall with intresting species and also some hummingbirds Berkenhof's Tropical Zoo Large hall with many tropical butterflies Passiflorahoeve Butterfly-farm with both a tropical hall as well as some outside aviaries for European species. Trying to breed with many species.
I haven't been to tons of butterfly houses myself, but the one at the Houston Museum of Natural Science is pretty great.
Found this nice video about Rotterdams Amazonica on FaceBook : https://www.facebook.com/video.php?v=1498008647115272