What an incredible feat of architecture, it is huge. I think my guide said that it is 14klm by slightly less on the sides. The top is very wide, probably.as wide as a street. The whole thing has been really well maintained and the city walls were breached to allow traffic. You can see the mat and where the drawbridge was placed. The interior is able to sustain a small town
Many people were taking the opportunity to cycle round the whole structure, I believe you can leave the bike at certain points on the wall.
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