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As in other episodes of the series, archaelogists and engineers attempt to duplicate ancient solutions to engineering problems. In this case, the problem, solved during the Sung dynasty, was creating an arched, single-span bridge from straight timbers.

As in other episodes of the series, archaelogists and engineers attempt to duplicate ancient solutions to engineering problems. In this case, the problem is the mystery of the giant stone heads of Easter Island.

Explores the ancient technology available to Egyptians to construct monolithic obelisks to honor their gods.

Examines how the trebucher, a mechanized catapult, made castles vulnerable in a medieval siege. Shows medieval experts recreating full-scale catapults.