Ключевые слова: ancient, architectural, architecture, barbican, bridge, building, bulgaria, bulwark, citadel, defensive point, defensive wall, exterior, facility, fort, fortification, fortification system, fortified, fortified outpost, fortress, hiking, historic monument, historical, landmark, medieval, medieval architecture, medieval citadel, medieval fortification, military construction, military engineering, no one, no person, nobody, old, outdoor, outpost, place, provadia, rampart, sightseeing, stronghold, tourism, travel, varna province,