Caerphilly is a market town in the South Wales Valleys, about 11 km north of Cardiff. The reason to come here is the castle — Caerphilly Castle is the largest in Wales and the second largest in Britain after Windsor. Built in the 1260s by the Anglo-Norman lord Gilbert de Clare, it was the first concentric castle in Britain and one of the earliest in Europe, with a sequence of moats, islands, walls within walls, and an extraordinary southeast tower that leans out at nearly ten degrees — more than the famous campanile at Pisa.
The town itself is a pleasant, compact place wrapped tightly around the castle. The medieval street pattern survives, the indoor market on Castle Street is one of the best in the valleys, and the local cheese — pale, crumbly, faintly sour — has carried the town's name far beyond Wales. A Big Cheese festival every July fills the streets with stalls, falconry, fire-eaters, and a great deal of caerphilly tasting.
The town is also the birthplace of the comedian and magician Tommy Cooper, commemorated by a statue near the castle moat, and a useful base for a short circuit of South Wales sights — Castell Coch and Cardiff are a fifteen-minute train ride south, the green ridges of the Brecon Beacons begin half an hour to the north, and the old mining valleys of Rhondda and Rhymney rise on either side.