Bryn Bras Castle

You'll find this Victorian castle perched above Caernarfon, a proper fortress of red sandstone that commands views across the Snowdonia foothills. It's a working museum now, though honestly, the exterior is what stops you in your tracks - all Gothic towers and baronial stonework that looks more fairy tale than Welsh. Inside, the rooms are furnished as they might have been in the 19th century, with period pieces and local history scattered through the halls. Not massive, and you can work through it in an hour or so without feeling rushed.

Historically-minded visitors will get the most from it. Families with young children might find it a bit static - there's limited interactive stuff, so it depends whether yours are the type to engage with period rooms. Walkers heading up Snowdon or exploring the Llanberis area will find it a convenient detour on the way through. The nearest town is Caernarfon itself, just down the road, so it slots neatly into a broader Snowdonia itinerary.

With several holiday parks within a mile or two - Llys Derwen is practically on the doorstep, Twll Y Clawdd and Snowdon View Park just a bit further - it's a natural stop if you're camping nearby. The real draw here is the castle itself rather than any grand interior spectacle, so manage expectations accordingly. Ring ahead for current opening times and admission fees, as details online are thin on the ground.