A cobblestone is a rounded stone, typically about the size of your fist or a bit larger, that people once used to pave streets and roads. These stones weren't perfectly square like modern bricks or smooth like asphalt. They were naturally rounded by water in rivers and streams over many years, then carefully fitted together to create durable road surfaces.

For centuries, cobblestones were the best solution for city streets. They could handle heavy wagon traffic, allowed water to drain between the gaps, and lasted far longer than dirt roads, which turned to mud every time it rained. Workers would set thousands of cobblestones close together, creating bumpy but sturdy roads that could serve a city for generations.

Many old European cities still have cobblestone streets in their historic centers, and you can find them in older American cities like Boston and Philadelphia too. Walking or riding over cobblestones creates a distinctive bumpy, rattling sensation. Modern paved roads are smoother and easier to travel on, which is why most cobblestone streets have been replaced, but the ones that remain give us a direct connection to how people built their cities hundreds of years ago.

You might hear someone describe a charming old street as cobblestoned (an adjective).