It was very probably during the actual fighting that those further additions were being made to the ramparts that cause them to look so impressive to-day. The walls were heightened and made thicker by building on the arch-supported walks, or even enclosing them in new masonry. About forty fresh towers were added, projecting toward the open country; some reach the height of seventy feet. Towers were likewise raised above the gates that were not so protected before. Between the great bastions, upon the walls were perched in many cases bartizans or saddle towers, projecting on either side, resting on large corbels built in between the huge battlements of older date; their outer walls rest upon arches that spring from corbel to corbel. Within they are open to the city like the great towers themselves. This is a curious feature of the work; the floors were all of timber and to make up for the lost stone walks double timber galleries ran along the walls within, one above and one below. The holes for their joists may still be seen, and ledges in the towers for the floors. All this open woodwork created a huge danger of fire, especially in the great towers, and, compared with other mediæval defences, particularly in France, the ramparts of Visby give the impression of being the work of amateurs. Nevertheless, from some points of view, the combination of low hills and sparkling sea and lofty towers recalls the mighty walls of the City of Constantine, whose capture by the Turks in 1453 was the beginning of the last act in the long mediæval drama. Little, however, did these brave defences effect against the forces of the Danes when in 1361 Visby was attacked and sacked by Waldemar IV., surnamed Atterdag, because, if once foiled, he was sure that his day of success would arrive. Close to the sea one of the city bastions is known as the Maiden Tower (Jungfrutornet).[78] There dwelt Nils the goldsmith, the liar, the loathsome traitor, the hideous thief. Such language his fellow-townsmen did well to use if in very truth on account of a petty slight he suggested the sack of Visby to the robber Danish king. A young girl, it was fabled, gave Waldemar information which enabled him to capture the fair town, and not unfitly she was walled alive into this very tower, from which circumstance it has its name. There can be little doubt that the only real foundation for these foolish tales was the fact that the merchants were somewhat ashamed of the very poor defence they made. Instead of defying the robber behind their strengthened walls, they abjectly permitted a breach to be torn when he refused to enter by a gate.