Lisbon metropolitan area
The Lisbon metropolitan area, centered in the Portuguese capital city of Lisbon, is the largest population concentration in Portugal. The population in 2011 was 2,821,876, of whom 547,733 (19.4%) live in the city of Lisbon. About 26.7% of the total population of Portugal lives in the Lisbon metropolitan area. The area of the Lisbon metropolitan area is 3,015.24 km, which is 3.3% of the total area of Portugal.
25 de Abril Bridge
The 25 de Abril Bridge "(Ponte 25 de Abril", 25th of April Bridge, ) is a suspension bridge connecting the city of Lisbon, capital of Portugal, to the municipality of Almada on the left (south) bank of the Tagus river. It was inaugurated on August 6, 1966, and a train platform was added in 1999. It is often compared to the Golden Gate Bridge in San Francisco, US, because they are both suspension bridges of similar color. It was built by the American Bridge Company which constructed the San Francisco–Oakland Bay Bridge, but not the Golden Gate. With a total length of , it is the 32nd largest suspension bridge in the world. The upper deck carries six car lanes, while the lower deck carries a double track railway electrified at 25 kV AC. Until 1974, the bridge was named "Salazar Bridge". The name "25 de Abril" commemorates the Carnation Revolution.