Topic: Tell me a short, interesting fact about

One intriguing fact about the Roman Empire is that it was one of the few ancient civilizations that used concrete for large-scale construction, creating structures like the Colosseum, the Pantheon, and Aqueducts, which stand as testaments to the technological prowess of the Romans even today. They mastered the art of pozzolana, a volcanic sand used as an ingredient in their concrete, making it stronger and more durable than other ancient methods.