My list, restricted only to exhibits I've actually visited. 1. North America: The North American area at Columbus 2. South America: Amazon and Beyond at Miami 3. Africa: Hard to look past the San Diego Safari Park, with Wilds of Africa at Dallas and Congo Gorilla Forest at Bronx as honorable mentions 4. Asia: Asia Trail at the Smithsonian National Zoo 5. Europe: Paris Vincennes by default really, I'm pretty sure it's the only European zoo exhibit I've ever seen 6. Australia: Taronga and Perth are the ones that stick out, outside of Australia probably Toronto. 7. Arctic/Antarctica: Arctic Ring of Life and the Polk Penguin Center at Detroit The question has to be asked, have you been to Valencia? I actually enjoyed the zoo more than a lot of people on this forum, but I have quite a few African areas higher than Valencia. Visually the zoo looks very nice and there are some good areas (Madagascar and the Hippo cave), but quite a few of the enclosures lack enrichment and size (apes especially), while there's not much species-wise outside of large mammals. Not a bad place at all, but as someone who's been to Disney and Valencia, Disney's enclosures are a lot better. Not entirely sure what you mean by this considering the zoo can't really control whether or not the animals are visible. On my two visits I've seen the Bears easily, underwater though, not so much.