The sections of the Great Wall near Beijing, Shanhaiguan and Jiayuguan have been well preserved and even reconstructed, but in many sites the Wall is in a poor condition, serving as a playground for some villages and a source of stones to rebuild houses and roads (now it is legally forbidden after Dec 1, 2006). Sections of the Wall are also prone to graffiti. 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 Gobi Desert is also encroaching on the wall in some places. Some estimates say that only 20% of the wall is in a good condition.