Rob visits San Francisco's Golden Gate Bridge and meets the people who keep it operational, as well as discovering the fascinating history of a bridge that many claimed was impossible to build.

Known locally as 'the Coathanger', Sydney Harbour Bridge is the world's tallest and widest steel arched bridge. Connecting the northern suburbs with the city centre, it brought together a city divided not just by water but by cultural differences. Rob explores the story of this engineering masterpiece, whose builders utilised the very latest technologies and techniques of their time, but which came at a cost.

A symbol of the Industrial Revolution, the elegant Iron Bridge over the river Severn in rural Shropshire was the world's first bridge to be constructed entirely from iron. Rob reveals the difficulties encountered in building it, the scepticism of contemporary engineers, how it inspired Thomas Telford to design the Pontcysyllte Aqueduct and the bridge's role as a catalyst for the birth of a civil engineering.