The Great Wall of China ends at the border with North Korea, near the city of Dandong in the Northeast of China. I visited the Hushan Wall (Tiger Mountain) during the Labor Day holiday 2016.
The wall here is contentious point with some Koreans (North and South). I’ve had heated comments on other forums and on Wikipedia either denying the wall exists or claiming it as a Korean wall not Chinese. The truth is that the late Ming dynasty, the Chinese did build a section of wall here. It didn’t stop at the modern day border, because that wasn’t the border during that time period. The wall here would have gone on into North Korea and curved westward, towards the sea. Excavations and investigation of this further section of wall are limited by the current political situation in the countries concerned. So for the time being this is the end of the wall.
The buildings you see are almost entirely modern reconstructions of the wall. Some commentators I have criticized the reconstitution as not being faithful to the original. They say the wall in Liaoning was later built than the walls near Beijing, and architecturally distinct. However, the reconstruction here copies the architectural style of the Beijing walls.
One key point of interest here is that the wall is right at the border with North Korea. At the base of the hill is a small waterway of only a few metres width, which marks the border between the China and North Korea. From the tower at the top of Hushan, you can see a considerable distance into Korea. Soldiers can be seen patrolling the border on the Korean side of the river and several Korean villages are nearby.