Malta's main maritime towns have merged into a fortified conglomerate known as the Three Cities, resting on the promontories opposite Valletta. Walking tours of the area are popular. Vittoriosa is the oldest town in Malta after Mdina. It features plenty of historical architecture, including several of the Inns of the Knights of St John, as well as a hospital built by the Order in 1672, which is still a Benedictine convent inhabited by devout nuns. Fort St Angelo, the oldest fortified part of Vittoriosa dating from 1274, stands at the tip of the promontory, and the Museum of Maritime History is also well worth a visit. The youngest of the Three Cities, Cospicua, dates from 1717 and features some interesting churches, while Senglea, designed by Grandmaster De La Sengle in 1551, is an important place of pilgrimage. Senglea's parish church contains a statue of Christ the Redeemer that is said to have miraculous powers.