1. The Forth Bridge

McCloud challenges his fear of heights with an ascent of the 340ft Forth railway bridge.

2. Salisbury Cathedral

McCloud tackles the walls and then the spire of the oldest building in the series: the medieval Salisbury Cathedral.

3. Jodrell Bank Radio Telescope

Kevin McCloud tackles the Jodrell Bank radio telescope as the designer and architectural journalist continues to scale some of Britain's highest structures. The ascent in Cheshire includes his worst moment so far - a perilous trip across a 1ft girder above a 200ft drop - before he climbs into the famous dish on top of the structure.

4. The Lloyds Building

Kevin McCloud scales one of the City of London's stand-out architectural icons, Richard Rogers 's Lloyds Building, and gauges employees' opinions of the edifice. He also looks into the various structures that have housed the ! institution overthe years and charts the course of Rogers's project, which reached its culmination in 1978.

6. The Anglican Cathedral

Kevin McCloud travels to Liverpool to climb the monumental Anglican cathedral. The structure was the life's work of Giles Gilbert Scott , but it wasn't completed until 17 years after his death, which was, in itself, 75 years since work began. Before climbing the outside to the top of the 150ft bell tower, McCloud examines the inside and stands beneath the highest gothic arches ever built.