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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.
The Great Wall of China was built over a period of about 17 centuries, between approximately 220 BC to the 17th century AD. The most well-known section of the Great Wall, located 43 miles northwest of Beijing, was built between the 14th and 17th centuries AD. The Great Wall is known, in China, as the Long Wall of Ten Thousand Li..