Lisbon Oceanarium

Open daily 10:00–20:00 with last entry at 19:00. On 24 and 31 December it closes at 19:00 (last entry 18:00) and on 25 December and 1 January it opens at 11:00. That is the whole calendar: no Monday closure, no Easter closure, no 13 June.

The price depends on when you enter, not how long you stay. The morning band (entry 10:00–11:30) is the dearest, the midday band (12:00–15:30) is €2 less, and the late band (16:00–18:30) is €4 less again. Once inside you stay until closing, so a 16:00 entry still gives you four hours, twice the average visit. The bands exist to push visitors out of the morning peak, and they work: the late slot is the quietest as well as the cheapest, and in our reading it is the slot to choose unless you have small children who fade by 17:00.

Buy online and the code ONLINE5 takes 5% off any of those prices — the official page prints the code openly, so it is a standing discount rather than a promotion. The Flexiticket at €41 (about $48) is undated and untimed within seven days; it exists for cruise passengers and rainy-day gamblers, and it is €16 more than the late slot. Under-3s are free at every hour.

The Global Ocean tank

The centrepiece is a 1,000-square-metre tank holding five million litres, seven metres deep, seen through four acrylic windows of 49 square metres each and a dozen smaller ones. About a hundred species share it — sharks, rays, tuna, barracuda and, most of the time, an ocean sunfish, which few aquariums manage to keep. Because the tank is deep the pelagic fish cruise above the bottom dwellers and the effect is of open water rather than a box.

The upper-floor windows put you at surface level with the rays; the lower-floor windows put you under the sharks.

Four habitats around it

Four tanks at the corners are separated from the central one only by acrylic, so from most angles they read as a single sea: the North Atlantic rocky coast with puffins and other seabirds above the water, the Antarctic coast with Magellanic penguins, the temperate Pacific with kelp and the two sea otters, and the tropical Indian Ocean coral reef. The otters are the crowd's favourite and the reason the Pacific corner jams at feeding time; twenty-five smaller themed aquariums along the route hold the seahorses, jellyfish, cuttlefish and the moray. The aquarium's own count is around 8,000 animals of some 500 species; the encyclopaedia figures are 16,000 individuals of 450 species, and the difference is how you count a shoal.

Forests Underwater and Submerged Universe

In a separate hall, 'Forests Underwater' is the Japanese aquascaper Takashi Amano's last work: a forty-metre planted freshwater tank of 160,000 litres, the largest 'nature aquarium' anywhere, opened in 2015 as a two-year show and kept ever since. On 29 August 2026 the official site said 'visit before 30 September', so it may finally be closing; if it is on your list, go before then. 'Submerged Universe', the newer immersive show, and the 'Sea Monsters' life-size models of prehistoric predators are included in the same ticket, as are the temporary exhibitions.

Worth it: yes, for anyone with children, for a rainy day, and for anyone who has never stood under a seven-metre wall of water with a sunfish drifting past. Compared with the city's monuments it is expensive — the late slot costs more than Jerónimos and nearly twice the cathedral — and it takes half a day including the metro out and back, so a two-day visitor with no children can skip it without regret. A three-day visitor should give it the afternoon of the day they see Parque das Nações anyway, and the rainy-day page puts it first for good reason.

Ethical: the question comes up in the search results, and the honest answer is that the Oceanário is a modern public aquarium of the kind that keeps animals in large, habitat-scale tanks rather than performing pools. It runs a Species Survival Centre and education programmes from pre-school to secondary level, holds no cetaceans and stages no shows, and the sea otters are a captive-born line originally loaned from Rotterdam. If you object to aquariums as such, none of that changes the argument; if you accept them, this is one of the better-run ones. Flash photography, selfie sticks and touching the animals are banned, and the rules are enforced.

The aquarium's own figure for an average visit is an hour and a half to two hours. Families with the otter feed and the Amano tank stretch it to three. There is no re-entry, so eat first or use the café.

On floor 0 there are 39 paid lockers in three sizes; anything bigger than the largest cannot be stored, which rules out suitcases on the way to the airport. The building meets the European accessibility standard with ramps and lifts throughout, pushchairs are fine on every level, and there is priority service for pregnant visitors and anyone with reduced mobility. Food and drink stay outside the exhibition halls. Phones on silent, no flash, no artificial light of any kind — the tanks are lit for the animals, not the camera, and the lower windows are dim enough that most phone photos come out blue and blurred; the upper windows in the morning band get the best light, which is the one thing the dearest slot buys you.

• Average visit 1 h 30–2 h (official)
• 39 paid lockers, sizes M, L, XL; no luggage larger than a locker
• Ramps and lifts on every level; priority for reduced mobility
• No flash, no selfie sticks, no food in the halls, no re-entry
• Under-3s free; pushchairs allowed

The address is Esplanada Dom Carlos I, Doca dos Olivais, Parque das Nações. The official directions name one metro stop, Oriente on the red line, and buses 705, 708, 725, 728, 744, 750, 759, 782 and 794. From Oriente walk out through the Vasco da Gama shopping centre to the riverfront and turn right; about ten minutes on the flat. From Baixa-Chiado it is about twenty-five minutes: blue line to São Sebastião, red line to Oriente. From the airport it is two stops on the red line, which is why the Oceanário is the classic last-morning sight before an afternoon flight — with the locker caveat above.

Fares are the 2026 Carris and Metro tariff: a single €1.90 (about $2.20) on a €0.50 navegante card, €1.72 zapping, or the €7.25 (about $8.50) 24-hour Carris and metro pass. Five car parks serve the district, the aquarium's own with 274 spaces and the Oriente station park with 2,000; the Parque das Nações page covers the district's own transport, including the cable car.

Give it a Monday afternoon or a wet one: red line out after lunch, cable car at 15:00 while the light is on the bridge, the 16:00 slot at the aquarium on the cheapest ticket, dinner on the riverfront or back in town by 19:30. The Lisbon with kids page builds a whole day around it with the Pavilhão do Conhecimento, the Parque das Nações page has the district, and the Lisbon in 3 days itinerary shows where the half-day goes. The things to do list ranks it against everything else, and the tickets index sets the official price beside the platform one for every sight.