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Lisbon's Oceanarium is one of the world's largest aquariums. Designed by American architect Peter Chermeyeff, it rises from the river and is reached by a footbridge.

It is a deep-sea diving experience without any of the risks, with about 25,000 fish, seabirds, and mammals in an enormous central tank that is the size of four Olympic-sized swimming pools.
Visitors can look into it from different levels for close-ups of the various creatures, including different species of sharks.

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