With more than 4,000 miles (6,437 km) to explore, there are hundreds of places where you can visit the wall http://on.natgeo.com/2xYS2k3

With more than 4,000 miles (6,437 km) to explore, there are hundreds of places where you can visit the wall http://on.natgeo.com/2xYS2k3 

https://twitter.com/NatGeoTravel/status/911651451230916609