Building the Chartres Cathedral pushed construction techniques to the limit, but behind this engineering triumph lies a dark story of violence, political double-dealing and destruction.

The Great Pyramid of Giza is 4,500 years old. It's the only ancient wonder of the world still standing. To cut and move the 2 million stones needed to build it would involve the whole Egyptian state.

Follow the dramatic story behind the building of the Colosseum in Ancient Rome. The Romans used innovative technology that we still use today, but the money to pay for the project enslaved the nation.