Tretower Castle

Tretower Castle (Welsh: Castell Tretŵr) is a Grade I-listed ruined castle in the village of Tretower in the county of Powys, Wales. It was built around the beginning of the twelfth century as a motte and bailey castle and this was probably replaced mid-century by a stone shell keep. The castle was enlarged in the early thirteenth century, but later fell into ruin.

• http://en.wikipedia.org/wiki/Tretower Castle