The Oriente Station and surrounding buildings were mostly built for Expo' 98 and the area is now known as the Parque das Nações and is remarkable in that it is an Expo site that was built to be re-used - the genius behind this was, in fact, originally a journalist. The cable car runs for about a kilometre along the Tejo.
More info from http://www.golisbon.com/sight-seeing/parquedasnacoes.html:
"Lisbon's World Fair was special because it hosted a record 130 countries and international organizations, was the 100th international exhibition since the Great Exhibition of London in 1851, the last one of the 20th century, and coincided with the 500th anniversary of Vasco da Gama's arrival in India and the United Nations' "Year of the Oceans."
The theme was "The Oceans: A Heritage for the Future," and the entire area at the eastern end of the city's waterfront was rebuilt for the event. When it was over, the new urban district was dubbed Parque das Nações (Park of Nations), and is now one of the largest urban redevelopment projects in Europe.
Most people arrive by metro, which stops at the stunning Oriente Station. From there many are drawn to the Vasco da Gama Shopping Center or head straight to the several popular attractions in the area. The main highlight is the state-of-the-art Oceanarium, hailed as the world's most impressive aquarium."