when was the construction of the berlin wall finished
Berlin Wall The "fourth-generation Wall", known officially as "Stützwandelement UL 12.11" (retaining wall element UL 12.11), was the final and most sophisticated version of the Wall. Begun in 1975[73] and completed about 1980,[74] it was constructed from 45,000 separate sections of reinforced concrete, each 3.6 metres (12 ft) high and 1.2 metres (3.9 ft) wide, and cost DDM16,155,000 or about US$3,638,000.[75] The concrete provisions added to this version of the Wall were done to prevent escapees from driving their cars through the barricades.[76] At strategic points, the Wall was constructed to a somewhat weaker standard, so that East German and Soviet armored vehicles could easily break through in the event of war.[76]
Berlin Wall In 1989 a series of revolutions in nearby Eastern Bloc countries—Poland and Hungary in particular—caused a chain reaction in East Germany that ultimately resulted in the demise of the Wall.[10] After several weeks of civil unrest, the East German government announced on 9 November 1989 that all GDR citizens could visit West Germany and West Berlin. Crowds of East Germans crossed and climbed onto the Wall, joined by West Germans on the other side in a celebratory atmosphere. Over the next few weeks, euphoric people and souvenir hunters chipped away parts of the Wall; the governments later used industrial equipment to remove most of what was left.[5] The "fall of the Berlin Wall" paved the way for German reunification, which formally took place on 3 October 1990.[5]
Burj Al Arab The building opened in December 1999.[18]
National World War II Memorial Ground was broken in September 2001. The construction was managed by the General Services Administration.