The limestone plateau of the southern Fforest Fawr is riddled with some of the largest and most complex cave systems in Britain. Most can only be visited by experienced cavers, but this set of three caves is well lit, spacious and easily accessible, even to children. The complex is just off the A4067, north of Abercraf. Tickets must be prebooked online in advance.
The highlight of the 1.5-mile self-guided tour is the Cathedral Cave, a high-domed chamber with a lake fed by two waterfalls that pour from openings in the rock. Nearby is the Bone Cave, where 42 Bronze Age skeletons were discovered. Dan-yr-Ogof Cave, part of a 10-mile complex, has glistening limestone formations.
