Completed in 1966 and originally named after dictator Salazar, this suspension bridge across the Tagus River changed its name after the revolution of April 25, 1974.
It's a spectacular sight from any direction, with an overall length of 2278m (approx. 1.5 miles), and the longest central span in Europe (1013m/3323ft), longer than San Francisco's Golden Gate Bridge, which it resembles.
Its foundations also hold the world record by going 80m (262ft) below the riverbed to stand on basalt rock.
Underneath it is an attractive dock and marina overlooked by restaurants and bars.
A museum and observation deck connected to one of the bridge's pillars was added in 2017 (accessed next to the Vila Galé Opera Hotel), allowing visitors to know about the history and engineering behind the bridge, while getting a view over the city from the top.
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Where: Best seen from Doca de Santo Amaro.
How: Take the Cascais train from Cais do Sodré, getting off at Alcantara-Mar station and exiting to the left, towards the river. To visit the observation deck, exit to the right and walk towards the Vila Galé Opera Hotel.
Docas - Attractive dock area with cosmopolitan
bars and restaurants.
Jeronimos Monastery - A World Heritage monument; Vasco da Gama's resting place.
Belem Tower - The city's icon; a symbol of the Age of Discovery.
Discoveries Monument - The world's explorers in stone.
Berardo Museum - World-class collection of modern art.
Coaches Museum - The world's largest collection of magnificent royal coaches.
Maritime Museum - The story of Portugal's pioneering role in world exploration at the sea.
Archaeology Museum - Archaeological finds from over the centuries.
Belem Cultural Center - Modern cultural center with regular exhibitions and events.
Tropical Garden - Beautiful garden with rare plants from around the world.
Belem Palace - The home of Portugal's President.
Memoria Church - Elegant neoclassical church.
Ajuda Palace - An extravagant royal palace.
Ajuda Botanical Garden - Beautiful gardens overlooking the river.
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