The San Diego Zoo is one of the truly must-visit z...

The San Diego Zoo is one of the truly must-visit zoos in the country. It's incredibly well-designed, serves as a home to a wide selection of exotic animals, and has lots of experiences that go above and beyond what one might normally expect of a zoo. That said, the $50+ admission is also a far cry from the free entry of the National Zoo, so be prepared for sticker shock.