Mutianyu Great Wall was first built in the mid-6th century during the Northern Qi, making it older than the Badaling section. In 1569, the Mutianyu Great Wall was rebuilt and till today most parts of it are well preserved. The Mutianyu Great Wall has the largest construction scale and best quality among all sections of Great Wall.

It is connected with Jiankou in the west and Lianhuachi and Jinshanling in the east. In 1569, the Mutianyu Great Wall was rebuilt, mainly with granite and is one of the best-preserved sections with the largest construction scale and best quality among all sections of Great Wall, being 7-8 meters high and 4-5 meters wide with 22 watchtowers on this 2,250-meter-long section. It served as the northern barrier defending the capital and the imperial tombs.

Built mainly with granite, the wall is 7-8 meters high and the top is 4-5 meters wide. Compared with other sections of Great Wall, Mutianyu Great Wall possesses unique characteristics in its construction.

1. Watchtowers are densely placed along this section of the Great Wall - 22 watchtowers on this 2,250-meter-long stretch.

2. Both the outer and inner parapets are crenelated with merlons, so that shots could be fired at the enemy on both sides - a feature very rare on other parts of the Great Wall.

3. The Mutianyu Pass consists of 3 watchtowers, one big in the center and two smaller on both sides. Standing on the same terrace, the three watchtowers are connected to each other inside and compose a rarely seen structure among all sections of Great Wall. 

There are 22 watch towers distributed at close intervals along the wall. They are located not only in the main wall but also at the distinctive 'branch cities'. Branch cities are built on the hill ridge against the inner or outer side of the wall. They measure from several yards to dozens of yards across. On the northwest over 3,281-feet hills, lies a section of the wall called 'Ox Horn Edge'. On the steep and lofty peaks, there are two walls named 'Flying Eagle Flies Facing Upward' and 'Arrow Lock'. What is more rarely seen on the southeast side is a general gateway platform guarded by three watch towers together. In locations of strategic importance, batteries are set up to reinforce the defense capabilities. Mutianyu Great Wall really deserves to be the archetype of the ten thousand li Great Wall.