“All Roads Lead to Rome”. This expression doesn’t just refer to the vastness of the Roman Empire. The Romans were the ones who invented roads (and concrete!). The “highways” of the time were built primarily for military purposes and economy stimulation, but they were so well-made that many of them are still in use today. The Romans built about 55,000 miles across the entire Empire out of gravel, dirt, and granite, and they also were the first civilization to use road signs and “highway patrols”.