With more than 10 million gallons of water, this wildly popular attraction is the world's largest aquarium. The 604,000-square-foot building, an architectural marvel resembling the bow of a ship, has tanks of various sizes filled with more than 80,000 animals, representing 500 species. The aquarium's 6.3 million–gallon Ocean Voyager Gallery is the world's largest indoor marine exhibit, with 4,574 square feet of viewing windows. But not everything has gills: there are also penguins, sea lions, sea otters, river otters, sea turtles, and giant octopi. The much-anticipated 84,000-square-foot AT&T Dolphin Tales exhibit, which opened in 2011, includes a 25-minute show (reservations required). Hordes of kids—and many adults—can always be found around the touch tanks. Admission includes entry to all public exhibits, shows, and galleries. Ninety minute behind-the-scenes tours are $48. Cafe Aquaria serves sandwiches, salads, and other light fare. There are often huge crowds, so arrive early or late for the best chance of getting a close-up view of the exhibits. Try to buy your tickets at least a week ahead. Online ticketing is best, with discounted rates and e-mailed tickets you can print out at home.