Hay Castle

The ruins of Hay Castle dominate the skyline above the market town of Hay-on-Wye, a jumble of stone walls and crumbling towers that's been standing here since Norman times. What you actually get is a walk around the exterior and through the grounds - the castle itself isn't fully open to the public, but the grounds tell enough of the story. There are decent views back across the town and towards the Wye Valley from the ramparts, and the stonework is genuinely impressive if you care about medieval architecture.

It's the sort of place where history enthusiasts will spend a solid hour picking out the different periods of construction, while families with younger kids might find it a bit sparse after 20 minutes. There's no tea shop or visitor centre, so come prepared. Free admission and open daily from 10am to 5pm, though checking the Hay Castle Trust website beforehand makes sense as opening can be weather-dependent.

The real appeal is how it plugs into a broader Hay-on-Wye break. The town itself is famous for its second-hand bookshops and the annual literary festival, so most visitors are here for that rather than the castle specifically. If you're staying at By the Wye Glamping just up the road, it's a 15-minute walk worth doing, especially if you're keen on castles. Hay-on-Wye Caravan Park sits even closer. The location on the England-Wales border means you're well-placed to explore the Wye Valley properly - the castle is less a destination in itself and more a pleasant addition to a weekend here.