Roman castles, also known as Roman fortifications, were military structures built by the Roman Empire to protect their territories and control local populations. These castles often featured thick stone walls, watchtowers, and gates, designed to withstand attacks. They served as bases for soldiers and were strategically located near roads or borders. In addition to military purposes, Roman castles also functioned as administrative centers. They housed officials and provided a place for trade and local governance. Many of these structures, such as Hadrian's Wall in Britain, still stand today, showcasing the engineering skills of the Romans and their influence on later fortifications.