The Oceanarium in Lisbon was built at the end of the millenium, and known as Europes largest sea museum.
The unique experience can be found in 16.000 animals and plants representing over 450 different species.
4 million litres is the amount of the water content in the tanks. This makes the Oceanarium to one of the biggest aquariums in the world.
© Duarte Bruno | Dreamstime.com