One of the world's largest aquariums. Built by American architect Peter Chermayeff, it hosts thousands of marine species of the oceans, such as sea otters, penguins, and sharks. The main tank is huge, representing the Atlantic environment, with hundreds of small fishes, sharks, barracuda, snappers, and a huge sunfish. Ideal for children.

The Lisbon Oceanarium (Portuguese: Oceanário de Lisboa, pronounced [ɔsi.ɐˈnaɾi.u ðɨ liʒˈβoɐ]) is an oceanarium in Lisbon, Portugal. It is located in the Parque das Nações, which was the exhibition grounds for the Expo '98. It is one of the largest indoor aquariums in Europe and approximately 1 million people visit each year.