Another notable section lies near the eastern extremity of the wall, where the first pass of the Great Wall was built on the Shanhaiguan (known as the “Number One Pass Under Heaven"), the first mountain the Great Wall climbs. Jia Shan is also here, as is the Jiumenkou, which is the only portion of the wall that was built as a bridge. Shanhaiguan Great Wall is called the “Museum of the Construction of the Great Wall", because of the Meng Jiang-Nu Temple, built during the Song Dynasty.
Characteristics

The steps that form the Great Wall of China are very steep and tall in some areas. Tourists often become exhausted climbing the wall and walk no more than a kilometre or two (around a mile).

The Wall is included in lists of the “Seven Medieval Wonders of the World” but was of course not one of the classical Seven Wonders of the World recognized by the ancient Greeks. The Wall designated a UNESCO World Heritage Site in 1987.

There is a longstanding disagreement about how visible the wall is in space. Richard Halliburton’s 1938 book Second Book of Marvels said the Great Wall is the only man-made object visible from the moon. This myth has persisted, assuming urban legend status, sometimes even entering school textbooks. The Great Wall simply cannot be seen by the unaided eye from the distance of the moon. Even its visibility from near-earth orbit is questionable.

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