defensive structure

A **defensive structure** refers to any built fortification or architectural design intended to protect a location or group from attacks, invasions, or other threats. These structures have been used throughout history, ranging from ancient city walls and castles to modern bunkers and barriers. Defensive structures are strategically designed to provide security, control access, and enhance the safety of inhabitants or valuable assets within their perimeter. Common examples include fortresses, trenches, moats, and watchtowers.