Skaith Motte

A grassy mound in the middle of nowhere, basically. Skaith Motte is what's left of a Norman fortification from around the 12th century - just an earthwork now, the kind of thing that doesn't immediately look like much until you realise what you're standing on. It's near Newton Stewart in Dumfries & Galloway, which means it's proper rural, the sort of place you'd only really find if you were already in the area.

Walkers will get the most from this one. There's no visitor centre or interpretation boards, so you're either genuinely interested in medieval Scottish archaeology or you're filing it away as a curiosity to mention back home. The mound itself is accessible enough if you don't mind a bit of mud, and it's the kind of stop that takes twenty minutes maximum - look, climb, take a photo, move on. Families with kids who are mad about castles might find it underwhelming after an hour of driving out to see a lump of earth.

There's no admission charge because there's nothing to charge for, which is refreshing. If you're staying at Barnharrow Holiday Pods five miles away, it's worth the detour on a dry day when you're exploring the local area. But I wouldn't plan a day around it. Best visited as part of a broader ramble through Dumfries & Galloway rather than as a destination in itself.