Carreg Cennan guards the Western corner of the Brecon Beacons from the top of a sheer 300 foot cliff. The only possible approach for medieval attackers lay on the Northern side, a steeply sloped hill well protected by a series of defenses. This made Carreg Cennan an ideal location as a hideaway for robbers in the 15th century. Much of the castle ruins now lie open to the sky, with daily visits by wandering sheep. A dark tunnel lies hidden beneath the castle, cut into the sheer cliff face and allowing residents to view movement in the valley via camouflaged windows. At the end of the underground passage lies a natural cave, large enough to accomodate several people at a time.

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