How did the Romans build roads and aqueducts that lasted thousands of years?

Two thousand years ago, the Romans laid down stone roads and stone water-channels that you can still walk on and trace today. No power tools. No concrete trucks. Just clever hands, sharp eyes, and a stubborn refusal to build anything flimsy. So how do you make something that outlives empires? Let's dig down — literally — and find out.
The first secret is that a Roman road wasn't really a road. It was a sandwich — a deep stack of carefully chosen layers. They didn't just slap stones on the dirt and call it a day. They dug a trench, sometimes shoulder-deep, and built the road UP from the bottom, one layer at a time.
