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Dimensions: How long, high, and wide. Simatai Great Wall is 5.4 km (3.4 miles) long, with altogether 39 watchtowers. At the east of Simatai, the elevation goes abruptly up from 295 meters (968 ft) to 986 meters (3,235 ft), making a breathtaking scene. The wall is very steep and perilous, with the narrowest part only 40 cm wide.
Over 2,000 years, many imperial dynasties and kingdoms built, rebuilt, and extended walls many times that subsequently eroded. The latest imperial construction was performed by the Ming Dynasty (1368â1644), and the length was then over 6,000 kilometers (3,700 miles). This is the wall often referred to when we talk about the Great Wall.