The Arrabida bridge over the River Douro in Porto. The concrete bridge was built in 1963 and was for sometime the widest single span concrete bridge in the world. It is 70 metres above the water and spans 252 metres Posted by Travel in Portugal on Sat, 21/12/2013 - 21:18 × Related images Downtown Porto BBVA building - Porto Torre dos Clérigos detail Ribeira - Another view... Mopeds in Foz - Porto Porto - Avenida dos Aliados Building