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Above are pictures of the eastern most point of the Great Wall of China. It reaches over 60 ft into the sea and is called the Old Dragon's Head because it is supposed to look like a dragon drinking from the water. Back in the day it must have seemed as if it were the end of the civilized world.
The Great Wall isn't continuous. There are a number of gaps in it, so it has many more east and west ends. However, the western most section of the wall ends at an oasis in the Gobi desert. There are watchtowers further west of the Wall's western terminus. I wonder if they planned on extending it?