1. Golden Gate Bridge

Rob Bell 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.

3. The Iron Bridge, Shropshire

Rob Bell explores the history and construction of the world's first bridge to be constructed entirely from iron.

4. Brooklyn Bridge

Rob Bell reveals that the building of the Brooklyn bridge was a classic New York tale of big money, corruption, ambition, death and tragedy.

5. The Millau Viaduct

Rob Bell looks at two bridges by British architect Lord Norman Foster - the Millau Viaduct in southern France and London's Millennium Bridge.

6. Severn Bridge

Rob Bell reveals why the design of the Severn suspension bridge revolutionised bridge-building and the dangers involved in the construction.