The greatest Church structures are marvels of engineering, technology and invention, representing both the glory of God and Man's ingenuity.
Five breakthrough monuments, each structure re-invented the engineering rulebook by demanding their builders go higher and bigger than ever before - sometimes leading to disaster as domes collapsed and massive walls and pillars buckled under the strain. We reveal the secrets of their epic construction using computer-generated imagery coupled with material specially-shot on location and interviews with experts.