Bull Pot

The entrance to Bull Pot is easy to miss - a modest opening in the limestone hillside near Carnforth, with nothing to suggest the proper underground river system waiting below. This isn't a show cave with electric lights and handrails. You're looking at serious caving territory, where the beck runs year-round and the water temperature stays chilly regardless of season.

What you get is a genuine working cave system, not a tourist attraction dressed up for casual visitors. The passage winds through rock formations carved by thousands of years of water flow, and if water levels allow, you can follow the stream deeper in. It's the sort of place that appeals to experienced cavers and dedicated underground explorers rather than families after a quick underground wander.

Visit outside flood season - winter rainfall can make the stream impassable - and bring proper kit. Helmet, torch, and warm clothing aren't optional. There's no admission fee and no set hours because you're essentially accessing a natural feature on land with public rights. Allow a couple of hours minimum if you know what you're doing, longer if you're keen to explore further.

Stay at Philpin Farm Campsite or Primrose Glamping Pods, both five minutes away, and you're well-placed for this bit of genuine karst landscape. It's a serious detour, not a casual stop, but the geology alone makes it worthwhile if you're serious about caving.