Topic: Tell me a short, interesting fact about

One fascinating fact about the Roman Empire is that Roman road-building technology was exceptionally advanced. For instance, many Roman roads were designed to be waterproof, with layers of sand, gravel, and compacted stone, topped by a thick slab of concrete. This made them durable and usable even in inclement weather. Some of their roads are still in use today, nearly 2,000 years after they were built.