Ardvannie, dun site

A crumbling Iron Age fortress sits on a windswept Highland promontory near Tain, its earthen ramparts still visible after two thousand years. Ardvannie is a dun - a fortified settlement that once housed a Celtic community, and walking the site feels genuinely solitary. There's not much left in terms of dramatic stonework, but the defensive ditches and raised platforms tell a story if you're willing to read the landscape.

History buffs will find it absorbing; casual walkers less so. You're looking at maybe half an hour on site unless you're the type who enjoys standing about trying to imagine what life looked like in the first century AD. The main appeal is the sense of place rather than any reconstructed buildings or interpretive boards. Bring a map and decent boots - it can be boggy, and the approach isn't signposted in the way you might expect.

It's free to visit, which is just as well because there's no visitor centre or facilities. Go when the ground's relatively dry, ideally May through September. The site works well as a stop during a broader Highland ramble, particularly if you're staying at Dornoch Firth Caravan Park or Ardgay Glamping nearby. Neither is more than a few miles away, making this a reasonable morning detour before heading to more obvious attractions. Tain itself has a handful of decent pubs and a historical whisky distillery if you need civilisation afterwards.