ancient buildings used as defensive walls around cities

view through an old embrasure in an alpine fortress of the world war i, marking the former austro-italian frontier in the dolomites, south tirol

边关古代将军举着残破的旗子手绘插画

old fort parker once defended the texas frontier.  home of sarah parker, mother of quannah parker, comanche chief

大漠中古代女子站在石头上吹笛手绘插画

aerial panorama view of newly restored ram castle former turkish stronghold on the bank of the river danube in serbia former yugoslavia

13th century jiayuguan pass, first frontier fortress at the west end of the great wall in gansu province, china

exterior panoramic view at the iconic almeida fortress main entrance, on almeida village, guarda, portugal

aerial view at sunrise of the fortress of valenca do minho in portugal

aerial view of the fortress of valenca do minho in portugal

panoramic exterior view at the iconic almeida fortress main entrance, on almeida village, guarda, portugal

exterior view at the iconic almeida fortress main entrance, on almeida village, guarda, portugal

jiayu pass, the first frontier fortress at the west end of the ming dynasty great wall

elvas is a portuguese municipality, former episcopal city and frontier fortress of easternmost central portugal, located in the district of portalegre in alentejo.

fort union trading post national historic site, partial reconstruction of the famous fur trading post on the upper missouri river

ancient wooden fortification stockade fence of reconstructed fortress under blue sky

view to narva castle and narva river from walls of ivangorod forteress. invangorod, russia

世界文化遗产，甘肃省酒泉市玉门关小方盘城

roman camp of petavonium occupied from 19 bc to 63 ad. santibañez de vidriales, zamora, spain.

宁夏盐池县长城关九曲黄河阵城市风光

moldova soroca. medieval landmark - soroca fortress

partial view of the walls of the valença do minho fortress. portugal.

aerial view of ulldecona castle, serra grossa mountain top, former frontier fortified complex old church, emblematic circular tower and square keep

gate tower buildings and city walls over traditional houses, under blue sky, at jiayu pass (jia yu guan), the first frontier fortress of ming dynasty great wall, in jiayuguan, gansu, china

carpathian mountains, serbia - june 29 2023 : the picturesque golubac fortress

fortress wall under blue sky at jiayu pass, first frontier fortress at the west end of the ming dynasty great wall of china, in jiayuguan, china

st. nicholas church and the assumption cathedral. ivangorod fortress. ivangorod. leningrad region. russia.

gate tower building and city walls over local houses, under blue sky and clouds, at jiayu pass (jia yu guan), the first frontier fortress of ming dynasty great wall, in jiayuguan, gansu, china

three color strips: blue sky, light yellow wall and grey earth. the wall is the outer boundary of jiayu pass (jiyuguan), the first frontier fortress at the west end of the great wall of china. 

aerial view at dawn of the fortified city of valença do minho, portugal

an ancient building viewed from the other side of a wall of jiayu pass (jiyuguan), the first frontier fortress at the west end of the great wall of china.

drone aerial view at sunrise of the fortified city of valença do minho, portugal

remains of almadena fortress (forte de sao luis) at the algarve coast in portugal

markeli was a medieval byzantine and bulgarian frontier stronghold, the ruins of which are located in karnobat municipality, bulgaria, europe

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