Gilestone

You won't find gift shops or visitor centres at Gilestone - just the weathered remains of a medieval settlement scattered across the Powys hillside near Brecon. The site consists of a handful of earthworks and foundations, remnants of what was once a functioning community, though exactly what you're looking at requires either a decent imagination or an archaeology degree.

It's the kind of place walkers stumble upon rather than deliberately seek out, which is precisely its appeal. The stones themselves won't take your breath away, but the location does - you get proper views across the Black Mountains and a genuine sense of standing somewhere people actually lived centuries ago, not in some polished heritage interpretation. Bring the OS map and commit to understanding what you're seeing, because there's no interpretation board to hold your hand.

History enthusiasts will get more from this than casual visitors. Kids might find it underwhelming unless they're keen on archaeology or scrambling about in the landscape. Allow an hour if you're making a dedicated trip, longer if you're combining it with walks in the surrounding hills.

The site sits handily between several good campsites - Pencelli Castle (1.5 miles away, highly rated) makes a sensible base, with Cwmdu and Cefn Cantref both within easy reach. It works well as a morning exploration before heading into Brecon proper for lunch. Free to visit, naturally, since there's nothing there to pay for. Don't expect much, and you'll leave genuinely pleased you found it.