Topic: Tell me a short, interesting fact about

One fascinating fact about the Roman Empire is that it's believed to have had the first recorded urban wastewater treatment system. The Cloaca Maxima, dating back to around 600 BC, was initially a combined sewer system that collected rainwater and waste from homes, streets, and the Tiber River in Rome. It's still in use today, making it one of the oldest continuously operating sewer systems in the world. It's a testament to the Romans' impressive ingenuity and forward-thinking approach to urban development.