San Diego Zoo ($20.00)

Everything here--from the striking animal habitats among the terrain's natural canyons to the directional signs that reveal a unified and understated aesthetic--is expertly crafted. Stamina is essential for taking it all in: Open-air trams and a Skyfari ride aren't bad ways to see the sights, but on foot is best. With more than 500 animal species on hand (many of them constantly whooping it up), as well as 6,500 plant species, you'll need more than one visit to really appreciate the zoo's exotic charms.