i have heard the wall is built out of crenel stone, can anyone justify what it is?

Question

I have heard the wall is built out of Crenel Stone, can anyone justify what it is?

Ms.SLEEPYHAMSTER · Answer

Of course, the wall is built in different ways. In mountains, it was built of bricks and stones, while in grassland or desert where these two materials are not available, people would use local sand mixed with strong plants to build the wall.

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