Welcome to one of the most breathtaking sights on the planet, San Juan de Gaztelugatxe. As you stand here, look out toward that jagged islet rising eighty meters above the crashing waves of the Bay of Biscay. The name itself carries a mystery; in the Basque language, it can be translated as The Rock of the Castle or even the Inaccessible Castle. You are currently in the Gibelortzagako San Pelaio area, a part of the municipality of Bermeo, though it feels a world away from any city. Feel the salt spray on your skin and listen to the Atlantic wind—this is a place where nature and history have fought for supremacy for over a thousand years. This tiny island is connected to the mainland by a man-made stone bridge that looks as if it were plucked straight from a fantasy novel. Prepare yourself, because you are about to walk a path that has been trodden by pilgrims, pirates, and even legendary kings.