Although all that remains of the ruined cliff-top Tintagel Castle, legendary birthplace of King Arthur, is the outline of its walls, moats, and towers, it requires only a bit of imagination to conjure up a picture of Sir Lancelot and Sir Galahad riding out in search of the Holy Grail over the narrow causeway above the seething breakers. Archaeological evidence, however, suggests that the castle dates from much later—about 1150, when it was the stronghold of the earls of Cornwall. Long before that, Romans may have occupied the site. The earliest identified remains here are of Celtic (AD 5th century) origin, and these may have some connection with the legendary Arthur. Legends aside, nothing can detract from the castle ruins, dramatically set off by the wild, windswept Cornish coast, on an island joined to the mainland by a narrow isthmus. Paths lead down to the pebble beach and a cavern known as Merlin's Cave. Exploring Tintagel Castle involves some arduous climbing on steep steps, but even on a summer's day, when people swarm over the battlements and a westerly Atlantic wind sweeps through Tintagel, you can feel the proximity of the distant past.