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Since Seoul City Wall was contained in the tentative list of world heritage of UNESCO,Seoul City has been trying to achieve the main World heritage of UNESCO – to prove itsoutstanding universal value(OUV) of 600 years long heritage. Seoul City Wall(서울 漢陽都城) is the longest City Wall (18.627㎞) among the existingcapital city walls in the world. Seoul City discovered 152 inscription stones February 2012, and added 120 – total 272inscription stones as of April 2014. 152 inscription stones(刻字城石) plus 97 TaeJo Period, the Thousand-Character Classic of them(initial construction period, 太祖年間 97개 千字文 刻字城石), total 249 dataare all contained in CAD (Computer Aided Design). 97 divisions were started from the east of Baegaksan Mountain(白岳山) ; Cheon(天) isfirst word of Thousand-Character Classic(千字文) to Jo(弔) ; 97th word of it. 97 divisions were inscribed by the Thousand-Character Classic(千字文); and 6 smalldivisions were inscribed by numbers(figures). Inscription was not simple doodling but individual / regional responsibility of buildingup Seoul City Wall. In 1396, when TaeJo(The first king : 太祖) of Joseon Dynasty first began to built upSeoul City Wall, was divided by 97 division, its total length 18.627㎞ each of it was 600Cheok(尺 ≒ 600feet) and each division was divided 6 small division(100尺 ≒ 100feet). The above facts was proved in each City wall inscription stones(刻字城石) and TheAnnals of Joseon Dynasty(朝鮮王朝實錄) also proved the facts. Each 60㎝ × 60㎝ Face stone is not the characteristic SukJong Period(肅宗年間), butbegan to Jeong Jo Period(正祖年間) and continued through SunJo Period(純祖年間) until the end of Joseon Dynasty. During SukJong Period(肅宗年間), recruited soldiers, partly according to the population increase, and partly their living, contributed to the professional building of Seoul City Wall and to the standardization of Face Stone : 40㎝ × 45㎝ rectangular size. In 1710, when SukJong(19th king : 肅宗) of Joseon Dynasty In the high sites of ParapetWall / Battlements( 女墻), bricks were used, but Body of Wall(體城) and in the otherlow sites of Parapet Wall / Battlements(女 墻), stones were used. Bricks were produced(by SueoCheong : 守禦廳) in the isle of ‘Mudeung Do’ / ‘JeoJa Do’ in the Han River. During SukJong Period(肅宗年間), when was inscribed of one word(Hun:訓 / Geum:禁 / Eo:禦), its meaning was one of 3 military troop(3軍門 : 訓練都監, 禁衛營, 御營廳) and these inscription stones(刻字城石) belong to rebuilding of Parapet Wall /Battlements(女墻)In 1751 (Yeong Jo 27, 英祖 27年) The Budget to collect Seoul City Wall restorationbuilders(technicians) was made according to the span of collapsed wall and needed rice. The location, the date, and the builders of inscription stones ara all proved true The Annalsof Joseon Dynasty(朝鮮王朝實錄), The Daily Records of Royal Secretarial of JoseonDynasty(承政院日記), Geumwiyeong repairing of Seoul City Wall Deung’rok(禁衛營都城改築謄錄), Eoyeongcheong songyouk Deung’rok(御營廳城役謄錄, Official Document job of Seoul City Wall written by Eoyeongcheong), Hungguk Deung’rok(訓局謄錄),Eoyeongcheong Deung’rok(御營廳謄錄), Geumwiyeong Deung’rok(禁衛營謄錄) allother official documents and all the on the spot excavations. During Yeong Jo Period, military storehouses(城廊) were removed in the City Wallfrom out of it ; all the numbers were about 75. these military storehouse(城廊) were very important to the standardization of their location : to the recording of collapses and rebuilding of Seoul City Wall. The Site of military Storehouses(城廊터) remained inside of Seoul City Wall werevery important to the standardization of their location : to the recording of collapses and rebuilding of Seoul City Wall. The site of military storehouses(城廊터) remained inside of the City Wall. Their remained sites are very important to the records of the collapse and rebuilding ofthe City Wall, particularly to the comparing of the inscription stones and their rebuilding regarded. The scale of restoration rebuilding and collapse is recorded in the unit of spans. 1 span was 10 Cheok(10尺≒10feet≒3.1m). Since 1812 1 span was changed 8Cheok(8尺≒8feet≒2.48m) Before 1812, Generally the fundamental unit of Battlement / Parapet Wall(女墻), ‘1Merlon(1垜)’ was similar to ‘1 span(間)’ of Rampart / Body of Wall(體城). The starts and the ends of the basic of restoration and collapse "span" are divided by the vertical / horizontal joints (守直 / 水平 이음部). Excavation researches reveal that vertical / horizontal joints(守直/水平 이음部) areused and bottom buttress stone of joints(바닥 버팀돌). Many officials and experts[(Seoul City Wall restoration builders(technicians)] includingmany supervisors took very important roles on the many major works at that time.

Hanyang(Seoul) was the center of politics, administration, and life in the Joseon Dynastyperiod. The Royal Palace was not only the place which the king lived in, but alsothe authority which represented the Joseon Dynasty. However, the Imperialism of Japanstarted to demolish and destroy the Royal Palace, Gyeonbokgung(景福宮) under thedevelopments of Hanyang. The Joseon Industrial exhibition, 5th anniversary under theImperialism of the Japan, hold in 1915 and the Joseon Exposition, 20th anniversary underthe Imperialism of Japan hold in 1929 were the important incidents that Gyeonbokgungwas demolished and the Imperialism of Japan publicized their advancement of cultureand modern civilization. Also, they replaced the Gyeoungbokgung by the Government-General Building and removed the boundary and graces of the palace. In consequence, the dignity of Joseon Dynasty and the historic urban landscape of Gyeongbokgung was fluctuated as the Imperialism of Japan had intended.