The slippy steps that go down to the cave.
Image credit: Chris Bickerton
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We went to Pembroke Castle last week (amazing place), there's a HUGE cave under that too that I had no idea about until then. themodernantiquarian.com/site/3930/wogan.html
Not as exciting as your twisty narrow one though.
Ah yes the Wogan, it's on my list, as is the castle.