The Oceanarium of Lisbon, with its 5,000,000 liter tank, is the largest indoor aquarium in Europe. Yes, even (!) bigger than Genoa aquarium. It reaches 7 meter deep, so that you can admire both pelagic and benthic species at the same time.
Here in the pictures a few of its 16,000 individuals. Can you spy the sunfish?
Pictures shot in the ex area of the World exhibition of Lisbon (1998). Click each picture to enlarge. From top line to bottom: the Portuguese (now empty) pavilion, the pedestrian area along the river Tejo, entrance to the Oceanarium, outside the Oceanarium, view on the expo area.