The Underwater Great Wall, China

 

Now this is an exciting portion of the Wall. Two different walls near each other named Xifengkou and Panjiakou are part of the Underwater Great Wall.

When they were first built, both sections were strong fortresses between the mountains. The construction of both walls took place in different centuries with Xifengkou built in the late 14th century and Panjiakou in the mid-16th century. 

Built by General Xu Da, Xifengkou was a major gateway to access central China. It had three gates linked by stone walls. Surrounded by mountains on three sides and a lake on the fourth, Xifengkou was very difficult to attack, although it still saw many battles due to its proximity to the northern borders. 

Panjiakou on the other hand was flanked by mountains and had Luanhe River running through it. This wall was built by General Qi Jiguang, another military leader who successfully reinforced many sections of the Great Wall. 

What made these two interesting was that both of them had parts of their walls underwater. When Panjiakou Reservoir was filled, it submerged the town of Panjiakou under 160ft (50m) of water, along with parts of Panjiakou Pass and Xifengkou Pass. A small part of Panjiakou Pass that was on higher ground is still above water. It is said that during low water levels, some of the underwater walls become more clearly visible. 

One endearing description likened the area to a giant dragon crawling along the winding wall towards the lake. Diving in, it later re-emerges on the opposite side, climbs up the ridges and lies down to rest on the lofty mountains.