Great Wall of China
Construction of the wall began in 221 BC and continued to grow until the 17th Century. The Wall stretches from Shanhaiguan in the east, to Lop Lake in the west, along an arc that roughly delineates the southern tip of Mongolia.
In 1987, this building was included in the list of UNESCO World Heritage Site. And now this giant wall of one of the best and the historic buildings that once existed, and serve as one of the Seven Wonders of the World.