Why do you think towns and cities are usually located adjacent to navigable waterways and natural harbors, going back thousands of years? Take a trip down the

Why do you think towns and cities are usually located adjacent to navigable waterways and natural harbors, going back thousands of years? Take a trip down the Rhein river some day. There's a medieval castle at every opportunity next to the river. They were built to extract tax from the river traffic. The Rhein was the highway through Germany until railroads.