Seven sisters saw mills

The Severn Estuary is where these old mills huddle along the riverbank, remnants of industrial Wales that most people driving through Powys completely miss. Seven water mills once ground grain here - now you're walking among moss-covered stones and the sound of actual water doing the work these buildings were built for.

It's a proper walker's spot, nothing fancy. You're picking your way along overgrown paths between the structures, reading the landscape as much as any plaque. The river does the talking - you can see exactly why someone planted a mill here three centuries ago. Photographers will spend hours; small children might get bored after half an hour unless they're into clambering on old walls.

The nearest town is Swansea, but you're really in the heart of Powys here, surrounded by the kind of countryside that makes Mid Wales worth the drive. Brecon Beacons Camping & Caravan Park sits just four miles away, making this an easy morning excursion if you're based there. The walk between the mills takes two to three hours if you're stopping to look properly.

Free to access - there's no formal visitor centre or facilities, so bring water. Best visited in drier months when the paths aren't complete mud. It's the sort of place that rewards wandering rather than rushing, where you notice things other people miss. Not Instagram-ready, which is precisely why it's worth going.