Of all the strongholds in the world, the Rook of Gibraltar is probably the most striking and impressive. Tartly by virtue of its strategic position at the entrance to the Mediterranean; partly by virtue of its imposing appearance; partly by virtue of its historical associations, it has at all times made a powerful appeal to the imagination. From the days when as Calpe, one of the Pillars of Hercules, which marked the limits of the known European world, it was the subject of myth and legend, to the present time, it has become a synonym for strength and for stability, a symbol of firmness and immutability and trustworthiness. 1