Tight'un

The entrance to Tight'un is exactly what the name promises - a proper squeeze. This cave near Appin in Argyll requires you to wriggle through a narrow opening in the rock face, which immediately tells you this isn't a tourist-friendly walk-through affair. Once inside, the passage opens into a small chamber where you can actually stand upright and explore the cave system properly.

It's the kind of place that appeals to people who like a bit of adventure without needing ropes and climbing gear. The cave itself is modest in size but genuinely atmospheric once your eyes adjust to the dark. You'll want a torch - a headtorch is ideal so you can keep both hands free for steadying yourself on the rocky surfaces. The whole visit takes maybe thirty minutes if you're taking it slowly and having a proper look around.

Kids aged ten and up will likely find it exciting rather than scary, though younger ones might struggle with the claustrophobia of the entrance squeeze. It's absolutely free, as far as anyone can tell - there's no facility, no visitor centre, just the cave itself waiting in the landscape.

If you're based at Creagan Station Tourers or Oban Camping and Caravanning Club Site, Tight'un works well as a short excursion rather than a whole day's activity. Combine it with walking around Appin or exploring the broader Argyll coastline. The cave is weather-dependent - go when it's dry, as the approach gets slippery in rain.