Craig Cerrig Gleisiad a Fan Frynych National Nature Reserve

The limestone cliffs around Craig Cerrig Gleisiad rear up from the valley floor with real drama, especially if you catch them in low light when the rock takes on a pale, almost ghostly appearance. This National Nature Reserve sprawls across the moorland between Brecon and the Black Mountains, and what makes it genuinely special isn't one single feature but the whole landscape - you get steep-sided valleys, cascading streams, and the kind of views that make you understand why people walk out here for hours on end.

Walkers will find this absolutely absorbing. The terrain is proper moorland and mountain, so it's not a casual stroll, but the paths are reasonably well-trodden and the reward is genuine wildness. Spring brings nesting birds to the cliffs, whilst summer fills the grassland with unusual plants - the sort of stuff that makes botanists genuinely excited. Birdwatchers should visit during migration season if they want the full experience.

It's free to roam, though you'll want proper boots and a map. Allow at least three hours if you're doing anything meaningful. Families with young kids might find the steep sections tiresome, but older children who can handle uneven terrain will remember this one.

Based near Brecon, you're perfectly positioned to combine this with other Beacons exploration. The glamping sites scattered nearby - Toad & Snail, Aber, Cefn Cantref - make logical bases if you're planning a proper walking break rather than just a day trip. The reserve demands time and decent weather. Visit on a misty day and you'll get atmosphere; visit in rain and you'll get wet and frustrated.