For animal lovers, zoos can be a mixed bag.
It's amazing to be in shouting distance of magnificent wild animals, but it's hard not to get the feeling that great apes, big cats and other creatures don't really love being behind bars, walls and windows.
Now, a Danish architectural firm is working with the Givskud Zoo and safari park in Denmark to break down those walls and create what they're calling Zootopia.
Glass-Free Menagerie: New Zoo Concept Gets Rid Of Enclosures : NPR