Brynich Aqueduct

The Brecon and Abergavenny Canal runs through some of Wales' finest countryside, and Brynich Aqueduct is the reason you'll want to leave the towpath and actually pay attention. Built in 1800 to carry the canal 19 metres above the River Usk, this industrial-age marvel sits just outside Brecon like a statement of Victorian ambition. The stone structure is genuinely impressive - five arches spanning the valley with barely a crack showing for over two centuries.

You walk underneath it, cross over it on the canal towpath, or simply stand at the riverbank staring up at the sheer scale of the engineering. It's not flashy, but it's real. Most people spend twenty minutes here rather than hours, though the surrounding canal walk is brilliant for stretching your legs. The riverside setting is proper lovely, especially in autumn light.

Brecon sits less than two miles away, making Brynich a perfect addition to exploring the town itself. If you're staying at Pencelli Castle Caravan Park or Cefn Cantref Campsite - both just along the canal - you can easily pop down for a walk. The towpath from either site connects directly. Families with young kids will manage the flat walk easily, and it breaks up a longer canal stroll nicely. Access appears to be free and the aqueduct is visible from the public footpath year-round. Best visited in the morning before tour groups drift through, though honestly it's never heaving.