Unless you know that Biddulph is an old coal mining area, you'll probably not guess that these three structures are ventilation shafts. The dangerous gases that build up in the old works down below can be released safely through them into the atmosphere.
The low brick walls around them give them a kind of arty feeling, and their arrangement even has echoes of standing stones.
Are they still in use? The layout seems a bit like a heritage artwork.
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Rusty Ring: Reflections of an Old-Timey Hermit
I would not have known that.
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