Beneath the castle is a vast cave called Wogan's Cavern, a natural chamber formed by water erosion through the soft limestone rock.
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Chepstow Castle at Chepstow, Monmouthshire, Wales is the oldest surviving post-Roman stone fortification in Britain. Located above cliffs on the River Wye, construction began in 1067 under the instruction of the Norman Lord William FitzOsbern.
Caerphilly Castle, South WalesLook out for the south-east tower – Wales' very own Leaning Tower, wonkier even than that of Pisa – which is probably the castle's best-loved feature.
Wales had about 600 castles, of which over 100 are still standing, either as ruins or as restored buildings. The rest have returned to nature, and today consist of ditches, mounds, and earthworks, often in commanding positions.
Blame it partly on Wales' history as a contested territory. Fighting over turf, the Normans, the native Welsh, and the English, led by expansionist Edward I, all erected epic fortresses in an explosion of castle building that dominated the 13th and 14th centuries.