You don't need to pay the entrance fee to view the aquarium, since there's a huge window right inside the Dubai Mall. But entering is more fun, and an aquarium tunnel leads to a deeper view as well as to a fascinating underwater zoo. The magnificent aquarium boasts over 30,000 tropical fish while the underwater zoo exhibits marine creatures from three ecological zones, including rainforest, rocky shore, and living ocean. Among the diverse sea life you'll see here are penguins, sharks, piranhas, lionfish, giant spider crabs, eels, and octopus. There's also a rock pool that children can explore, as well as a glass bottom boat offering a chance to feed the fish.