Eton Hole

You'll find yourself squelching through boggy moorland near Appin to reach this modest limestone cave, and honestly, that's half the appeal. Eton Hole isn't a grand cathedral of rock - it's a proper wee cave system that demands a bit of effort to access, which means you won't find crowds here. The entrance opens into a surprisingly spacious chamber with a burn running through it, and the whole thing has that slightly eerie, damp atmosphere caves do so well.

It's worth the trek if you're into geology or simply fancy something different from the usual Highland tourist trail. The cave itself won't occupy more than 45 minutes to an hour, so best paired with other walks in the area rather than made a sole destination. Families with older kids who don't mind getting their boots muddy will enjoy it; younger children might find the scrambling bit tedious.

You're genuinely in the middle of nowhere here, which is precisely why it works. There's no visitor centre, no gift shop, no opening hours to fret about - just you and the cave. Bring a torch, wear proper waterproofs, and watch your footing on the approach. Creagan Station Tourers is just 3.5 miles away, making this a sensible side trip if you're based there. The wider Appin area offers proper hiking, so slot this in as a morning detour rather than your main event. It's the kind of place that sticks with you precisely because it hasn't been over-developed.