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Concrete
The opus caementicium, or the tough Roman concrete, was what set the Romans from others. This magnificent invention set forth a building renaissance in the whole of Rome. The Roman concrete is made of limestone, concocted with volcanic ash to become a mortar. The mixture, along with lumps of bricks, became the building blocks for the construction of sturdy bridges, aqueducts and stunning buildings that endured the tests of time. These include the famous Colosseum and the Pantheon. A powerful nation at that time, they brought this technology to every nation they conquered and built equally enduring architectural wonders that still majestically to this day.
