drone flight over a Celtic oppidum from the Iron Age visualizing part of its reconstructed walls and the entrance to the town located on a granite hill with a reservoir in the background Avila, Spain

drone oppidum celts iron age walls rebuilt populated hill granitic reservoir avila spain archeology history antiquity exploration technology landscape heritage cultural discovery excavation architecture aerial 2997fps anthropology nature adventure discover landscaping tourism patrimonial remains ancient vestiges display air archaeological flyby investigation conservation historiography interpretation recognition