• Window to the Ocean room with a 7-meter interactive screen where young kids play and watch short films about the sea
• CulturaMAR combined pass also covers the Navy Museum, the frigate D. Fernando II e Glória and the Planetarium, valid for four months
• Train plus a short hop: Cascais line to Algés, then Carris bus 776 to the door or a 10-minute walk

One of the world's oldest aquariums, opened in 1898 and run by the Portuguese Navy. Downstairs, five rooms hold around 90 tanks with more than 300 live species, from Portuguese coastal fish to tropical reef fish, seahorses and freshwater species. The Window to the Ocean room has a giant interactive screen for young kids. Upstairs, King Carlos I's collection of preserved sea creatures fills the Noble Hall.