flight with overhead view over the reconstruction of the walls and the entrance of a ancient Celtic city from the Iron Age we see housing structures attached to the wall inside in Avila Spain

drone oppidum celts iron age walls reconstructed overhead view ancient city walled city populated avila spain archeology history antiquity exploration technology landscape heritage cultural discovery excavation architecture aerial 2997fps fortified town anthropology nature adventure discover landscaping tourism patrimonial remains ancient vestiges display air archaeological flyby investigation conservation historiography interpretation recognition