Opened in 1998, the Oceanário was the centerpiece of the XXth Century's last World Fair, themed "The Oceans, a Heritage for the Future", and eternally binds Lisbon to the Oceans. With over one million visitors per year, the Oceanário welcomes the largest number of patrons anywhere in the country.

While walking through impressive and unforgettable exhibits, visitors are encouraged to learn fascinating things about the oceans and, more importantly, how to make decisions in their daily lives that actively promote the conservation of nature.