One of the best attractions at OdySea, a mammoth aquarium in Scottsdale, is a theater experience that mimics a deep-sea diving expedition. As visitors sit in a large auditorium, the ground rumbles and the entire room rotates past several gigantic glass aquariums. You can gawk at the sharks, sea turtles, jellyfish, and stingrays without leaving your chair. Five hundred animal species can be found at OdySea, which bills itself as "America's newest aquarium" and the largest aquarium in the Southwest, boasting 200,000 square feet of space. It's best not to think about the 2 million gallons of water required to operate this aquarium in the middle of the desert. But the exhibits featuring freshwater and saltwater creatures are well worth the price of admission.