Topic: Tell me a short, interesting fact about

One fascinating fact about the Roman Empire is that it was the first European power to adopt the use of cement on a large scale. This allowed them to build incredible structures like the Colosseum, Pantheon, and aqueducts, which still stand as engineering marvels today. The Roman cement, known as pozzolana, was a volcanic rock dust from the ancient city of Pozzuoli near Naples, and it was mixed with lime and water. This mix, known as opus caementicium, formed a strong, water-resistant concrete that stood the test of time.