To see the whitewashed walls gleaming and the flags fluttering in the breeze, we have to screw up our eyes and work our imaginations hard. However noble and refined the interior may once have been, chances are it now seems crude and Spartan. We constantly have to remind ourselves that, despite the dripping rainwater, grassy floors and mossy walls, castles were once sophisticated, sumptuous buildings, full of light, warmth and good cheer. Raglan Castle, however, is an exception. Hidden in the hills of south Wales, this magnificent building is one of the grandest ruins in Britain, where every inch of stonework speaks of past splendour. Heraldic devices and coats of arms still adorn the walls; gargoyles grimace at us over the gate. The stained glass is gone from the windows, but the fine stone tracery remains intact. Everything seeks to persuade us that this was once the most splendid place imaginable. With a great tower and a moat, two courtyards and gatehouses, and built on the site of an earlier motte and bailey, Raglan is almost overqualified as a castle.