The expressway passes by the Great Wall of China in the Badaling region.
As a result, it offers three exits which are linked immediately (or in the vicinity of) with the Great Wall. (
Note: All of these exits are in the split section of the expressway heading out of Beijing.)

Juyongguan Exit - Exit No.
15: The Great Wall at Juyongguan Pass is linked immediately with the expressway.
Juyongguan Pass is a fort which is nearest Beijing the most.
Needless to say, a stretch of Great Wall is also next to the Pass.

Shuiguan Exit - Exit No.
16: The Great Wall at Shuiguan is little-known and extremely steep.
From the top there are views and a place to see (though not visit up-close) a stretch of the Wall which has yet to be repaired (also known as "the wild Great Wall").
Note: There is no entry back into the expressway; you must proceed by minor routes back to Juyongguan.

Badaling Exit - Exit No.
18: The most famous and most frequented of all three exits is the one at Badaling.
After passing a large car park, you head for the Badaling Great Wall, which has been frequented by millions of visitors.
The expressway passes by the Great Wall of China in the Badaling region. As a result, it offers three exits which are linked immediately (or in the vicinity of) with the Great Wall. (Note: All of these exits are in the split section of the expressway heading out of Beijing.)
Juyongguan Exit - Exit No. 15: The Great Wall at Juyongguan Pass is linked immediately with the expressway. Juyongguan Pass is a fort which is nearest Beijing the most. Needless to say, a stretch of Great Wall is also next to the Pass.
Shuiguan Exit - Exit No. 16: The Great Wall at Shuiguan is little-known and extremely steep. From the top there are views and a place to see (though not visit up-close) a stretch of the Wall which has yet to be repaired (also known as "the wild Great Wall"). Note: There is no entry back into the expressway; you must proceed by minor routes back to Juyongguan.
Badaling Exit - Exit No. 18: The most famous and most frequented of all three exits is the one at Badaling. After passing a large car park, you head for the Badaling Great Wall, which has been frequented by millions of visitors.
Badaling Expressway