"I won't forget," Nan assured her, and forthwith started to make her way to the top of the great promontory on which stands all that still remains of King Arthur's Castle--the fallen stones of an ancient chapel, and a ruined wall enclosing a grassy space where sheep browse peacefully. Quitting the cottage and turning to the left, she bent her steps towards a footbridge spanning a gap in the cliff side and, pausing at the bridge, let her eyes rest musingly on the great, mysterious opening picturesquely known as Merlin's Cave. The tide was coming in fast, and she could hear the waves boom hollowly as they slid over its stony floor, only to meet and fight the opposing rush of other waves from the further end--since what had once been the magician's cave was now a subterranean passage, piercing right through the base of the headland. For a while Nan loitered on the bridge, gazing at the wild beauty of the scene--the sombre cove where the inrushing waves broke in a smother of spume on the beach, and above, to the left, the wind-scarred, storm-beaten crag rising sheer and wonderful out of the turbulent sea and crowned by those ancient walls about which clung so much of legend and romance. Perhaps the magic of old Merlin's enchantments still lingered there, for as Nan stood silently absorbing the mysterious glamour of the place, the petty annoyances of the day, the fret of Lady Gertrude's unwelcoming reception of her, seemed to dwindle into insignificance. They were only external things, after all. They could not mar the loveliness of this mystic, legend-haunted corner of the world. At length, with a faint sigh of regret, she crossed the bridge and walked slowly up a path which appeared to be little more than a rough track hewn out of the rocky side of the cliff itself, uneven and strewn with loose stones. Nan picked her steps gingerly. At the top of the track her way turned sharply at right angles to where a narrow ridge--so narrow that two people could not walk it abreast--led to Tintagel Head. It was the merest neck of land, very steep on either hand, like a slender bridge connecting what the Cornish folk generally speak of as "the Island" with the mainland.