From the Oceanarium, a cable car takes visitors to the futuristic Vasco da Gama Tower. It is named after one of Portugal's greatest explorers and was opened in 1998, on the 500th anniversary of his voyage to India.Its shape evokes a nautical sail, and standing at 145m/575ft high, it is Lisbon's tallest building.At the top is a viewing platform (inspired by a topsail basket, reached by panoramic glass elevators) that provides a grand view over Lisbon, the river, and Vasco da Gama Bridge. The building has been turned into a Dubai-looking luxury hotel which opened in late 2012 -- Myriad Hotel.Ride Lisbon's metro, buses, and trams for FREE with the Lisboa Card.