fences (site elements) <p>Roofless enclosures, barriers, defenses, or bulwarks, such as a railings, walls, hedges, or palisades constructed along the boundary of a field, park, yard, or another place for the purpose of defending from intruders, marking boudnaries, or keeping livestock or people within.</p> <p> </p> <p>Source: Art and Architecture Thesaurus</p> <p><a href="http://vocab.getty.edu/page/aat/300005044">http://vocab.getty.edu/page/aat/300005044</a> </p>