North Pot

The entrance to North Pot sits tucked into the Yorkshire limestone near Skipton, and it's genuinely one of those underground spaces that makes you understand why people get obsessed with caves. You're looking at a proper vertical shaft descending into darkness - the kind that makes your stomach do a little flip before you've even started climbing down. Once you're inside, the passage opens into a chamber where water flows through, and the geology is absolutely on display: smooth rock walls carved by underground streams over thousands of years.

This isn't a gentle tourist cave with handrails and mood lighting. North Pot demands a bit of effort and a willingness to get your hands dirty. Caving experience helps, though determined walkers can manage it. You'll need proper kit - helmet, headlamp, and clothes you don't mind ruining - and the whole thing takes a couple of hours if you're taking it seriously. It's the kind of activity that appeals to families with older kids who fancy something beyond the usual park stroll, and to anyone who wants bragging rights over a cream tea back in Skipton.

If you're based at Howgill Lodge or Bolton Abbey Estate, North Pot makes a brilliant wet-weather alternative to the usual Pennine walks. The cave's free to access, though you'll want to check locally about group visits and any seasonal restrictions. Spring's probably best - less chance of the water being dangerously high. It's not a quick tick-box stop; it's a proper adventure.