These commercially run, giant indoor tanks showcase local marine life, beginning with the Spree River, moving on to Berlin's lakes, and then taking you from fresh- to saltwater. Waterfront city scenes are part of the decor, which gradually give way to starfish-petting beds, overhead tanks, and a submarine-like room. Don't come looking for sharks or colorful tropical fish: the most exotic creatures here are perhaps the tiny sea horses and spotted rays. The aquarium's finale is the Aquadom, a state-of-the-art glass elevator that brings you through a silo-shaped fish tank to the exit. Young children love this place, but the timed wait for the elevator can be frustrating for all ages. Be prepared for a line at the entrance, too.