山海关 or the Shan Hai Pass is one of the most important and the most easterly of the passes through the Ming Great Wall.
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It is built as a square, with a perimeter of around four kilometres (2.5 mi). The walls reach a height of 14 metres (46 feet), and are seven metres (23 feet) thick – see bottom picture. The east, south and north sides are surrounded by a deep, wide moat with drawbridges over it. In the middle of the pass stands a tall bell tower.
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The location where the wall meets the Bohai Sea is nicknamed the “Old Dragon’s Head” (老龙头). The pass lies nearly 300 kilometres (190 mi) east of Beijing and if I could be bothered there’s a picture in this blog of that as well, guess you’ll just have to find it yourself.