Ballycastle Dun

The ruins of an Iron Age fort sit on a headland just outside Oban, commanding views across the Firth of Lorn. What remains are earthen ramparts and stone foundations - nothing dramatic, but enough to make you understand why someone chose this spot to build a stronghold two thousand years ago. The landscape does the heavy lifting here. You're standing on a promontory with water on three sides, wind in your face, and the kind of vista that made ancient people think strategically about defence.

It's not a major draw on its own - you'll spend forty minutes here if you're thorough, twenty if you're just passing through. But if you're already staying at one of the nearby holiday parks like Sunnybrae or Argyll Kayaker Cove, it makes a decent morning walk. Families won't find it thrilling unless the kids are genuinely interested in archaeology. Walkers and history types will appreciate the quiet and the effort required to reach it - the approach involves a proper hike across rough ground, which filters out the casual visitors.

There's no visitor centre, no interpretation boards to speak of, and no facilities. Go in decent weather and bring proper shoes. The real value is in combining it with a day exploring Oban itself or linking it to longer coastal walks in the area. Free to visit, naturally - it's just an old fort on a hillside. Worth the detour if you're in Argyll for a week, but not worth planning a trip around.