Dún is a term that refers to a fortified hill or a stronghold, often found in ancient Celtic cultures. These structures were typically built on elevated ground, providing strategic advantages for defense and visibility. Dún sites are significant in archaeology, as they offer insights into the social and military practices of early societies. Many Dún sites are located in Ireland and Scotland, where they served as residences for chieftains and their families. The remains of these structures often include stone walls and earthworks, showcasing the engineering skills of the time. Today, they are important historical landmarks that attract researchers and tourists alike.