DescriptionThe back door of Tre'r Ceiri - geograph.org.uk - 662049.jpg
English: The back door of Tre'r Ceiri A remarkable feature of the fort is this ancient 'man-sized' hole in the inner wall, leading to the area between the two walls. At this point the inner wall is about 10 metres thick.
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== {{int:filedesc}} == {{Information |description={{en|1=The back door of Tre'r Ceiri A remarkable feature of the fort is this ancient 'man-sized' hole in the inner wall, leading to the area between the two walls. At this point the inner wall is about 10