Mutianyu, China - Interior of the Great Wall of China. The wall stretches over 6,000 mountainous kilometers east to west across

- Image ID: H8M63D
Edwin Remsberg / Alamy Stock Photo
Image ID: H8M63D
Mutianyu, China - Interior of the Great Wall of China. The wall stretches over 6,000 mountainous kilometers east to west across North China and through 15 provinces.