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Appears that there is a walk path worn through the growth, but otherwise the top of the wall is completely covered. Also remember that wall is massive and very tall. Doesn’t look like the type of place to grow moss and the tree growth around it runs right up to it.
Since the largest sections can be fit inside the majority of the repliers’ asses to this comment, I think it makes sense for the top 10-15 feet to be exposed.