Aqua World, Pittsburgh

It's not easy to imagine what 550 display tanks and 20,000 gallons of water looks like in one place. But those are the impressive figures are Aqua World, where living inside it all are hundreds of species of fish, amphibians, and reptiles. But they're not all there just for show, either. Every tank and its inhabitants—from colorful fish and turtles on down to the designer coral they swim through—is for sale. The shop's experts specialize in the care of freshwater and saltwater fish, reptiles, birds, and other small animals, and the lend their expertise to every customer's questiona. They also carry all the unique foods, toys, accessories, and products an owner needs to care for their animals, including water additives, medicines, and articles on what to do if you accidentally let your fish watch The Truman Show.