missed one!

....and it's one which ties the previous two posts together quite neatly: Secret Underground Bristol tells the story of lots of fascinating things which are buried under the streets of Bristol, including the two I mentioned in the previous post, as well as things like the River Frome which runs unseen under the centre of the city, and Pen Park Hole, a massive (60 metres deep) underground cavern situated roughly here. No chance of that one being opened up to the public unfortunately, as you'd be not so much "wandering round" as "plummeting to your death".