clipped from: geography.about.com   

Since the Great Wall was discontinuous, Mongol invaders had no trouble breaching the wall by going around it, so the wall proved unsuccessful and was eventually abandoned. Additionally, a policy of mollification during the subsequent Ch'ing Dynasty that sought to pacify the Mongol leaders through religious conversion also helped to limit the need for the wall.


Through Western contact with China from the 17th through 20th centuries, the legend of the Great Wall of China grew along with tourism to the wall. Restoration and rebuilding took place in the 20th century and in 1987 the Great Wall of China was made a World Heritage Site. Today, a portion of the Great Wall of China about 50 miles (80 km) from Beijing receives thousands of tourists each day.