In one of the biggest engineering projects of the Middle Ages, Salisbury Cathedral was moved from a wind-blasted Iron Age hill fort to its current location - a feat accomplished in just 38 years, helping establish the Wiltshire city in the process. A place of both ancient tradition and home to one of the country's oldest choirs, Tony witnesses the ritual of inducting a new chorister and sees the oldest working clock in the world. The presenter also reflects on the cathedral's role in a clandestine operation that helped turn the tide of the Second World War.