In 1987, "Great Wall" had been listed as one of the world's heritage site by the UNESCO.
The Great Wall is considered to be the world's longest man-made infrastructure, stretching over a formidable 6,352 kilometer, from Shanghai Pass on the Bohai Sea in the east, at the limit between "China proper" and Manchuria (Northeast China), to Lop Nur in the southeastern portion of Xinjiang Uygur Autonomous Region. Along most of its arc, it roughly delineates the border between North China and Inner Mongolia.
While some portions near tourist centers have been preserved and even reconstructed, in many locations the Wall is in disrepair, serving as a playground for some villages and a source of stones to rebuild houses and roads. Sections of the Wall are also victims of graffiti and vandalism. Parts have been destroyed because the Wall is in the way of construction sites. Intact or repaired portions of the Wall near developed tourist areas are often plagued with hawkers of tourist kitsch.
The Wall was made a UNESCO World Heritage Site in 1987. Mao Zedong had a saying: "You're not a real man if you haven't climbed the Great Wall".