Smoo Cave

The moment you step into Smoo Cave near Durness, you're walking into something genuinely impressive - a massive sea cave with a freshwater burn running through it, complete with a small waterfall that crashes down from the cliff above. It's the kind of place that feels properly remote, which it is, sitting right on the north coast of the Highlands where the land just runs out into the sea.

You can walk straight in without fuss. The main chamber is enormous, high enough that you forget you're underground, and the sound of the water echoing off the stone is mesmerizing. If you're feeling adventurous (and dry-shod), a boat operator sometimes runs trips deeper into the cave during summer months to reach the inner chamber - though this depends on water levels and weather, so check locally before making the journey.

Families with older kids will find it genuinely thrilling rather than claustrophobic. Younger ones might find the darkness a bit much, and the uneven floor requires proper footwear. Walkers and geology types will spend a solid hour here without getting bored. There's no charge to enter, which is refreshing.

The cave sits just a short drive from Sango Sands Oasis holiday park, making it a natural stop if you're basing yourself there. It's not a massive detour from Durness either - worth the trip if you're exploring the north coast, though expect to share it with other visitors during peak season. The raw scale of the place makes it well worth the journey.