The St. Bartholomew's Cathedral is in the heart of the Fortified Citadel of Lipari. To counter the repeated Saracen raids, in 1083, Count Roger I of Hauteville had sent Benedictine monks on the island to built a monastery near the Castle: at the head of the work, the abbot Ambrose, who started the construction of the Norman Cloister reached us. Destroyed by the Turks, the Cathedral was rebuilt in 1516 by Charles V, who embarks on a major fortification of Sicily and the Aeolian Islands. The new Cathedral, with three naves, stretches on the north side of the Cloister, formerly a cemetery, then concealed by a wall until 1978, when Luigi Pastore has rediscovered it and reported to the Superintendence. Initially quadrangular, the Cloister at the center hosts a garden surrounded by columns of great value, because from ancient Roman houses. The facade stands atop a spectacular staircase and is characterized by two smaller side entrances, topped with stained glass windows, and a main door lintel. The eardrum is four orders of decreasing pediments rectangular connected by spirals. On the left, there is the massive square bell tower in section, with lava stone cornices, ovoid blind windows, single and watching windows. Inside, the nave is characterized by cross vaults with depictions of biblical episodes. The Cathedral houses the relic of St. Bartholomew's thumb.