The dramatic ruins of Tintagel Castle sit atop craggy hills with waves crashing against steep cliffs. Dating from the 13th century, the fortress is located in the far south-west of England in the county of Cornwall. It’s a fascinating remnant from the Middle Ages. But it also looms large in the British imagination as the dramatic site of the legendary King Arthur’s life and times, the monarch who presided over the Knights of the Round Table.