One local legend says that the country's name derives from the phrase Port of Gaul; most such speculation revolves around the city of Oporto on the Duoro River to the north. Lisbon -- the largest city and seaport -- on the Tagus River is thought to have been established as a Phoenician trading post among the native Indo-European Celts who had recently displaced the Pre-Celtic natives about 1200 BCE.
Lisbon is one of the oldest cities in the world and the oldest city in Western Europe, predating other modern European capitals such as London, Paris and Rome by hundreds of years.
The suspension bridge -- Ponte 25 de Abril -- may remind you of The Golden Gate Bridge in another earthquake-prone city. Of necessity, it towers over the harbor approach unlike its much lower neighbor upstream, the 17+ km Vasco da Gama.
The Ponte 25 de Abril bridge into the center of Lisbon was built in the early sixties and initially named the Salazar Bridge after the Prime Minister; it was renamed after date of the Carnation Revolution which overthrew the dictatorial Estado Novo in 1974.
The cruciform structure on the south bank is an homage to the statue of Christ the Redeemer on Corcovado above Rio de Janiero. From some angles http://smu.gs/ZCVEQb) it kind of looks like a tuning fork stuck in the ground, but is actually a carillon.