A former inn nestled in the foothills of the Black Mountain, this wonderfully remote hostel and campground has no TV, wi-fi or mobile-phone reception. It does, however, have some wonderful walks on its doorstep, including the track to Llyn y Fan Fach. There's a large kitchen but you'll need to bring all your own food.
Llanddeusant YHA
Parc Cenedlaethol Bannau Brycheiniog