Unremarkable from the outside, but incredibly ornate on the inside. Each of the different 'langues' (knights of a particular nationality had their own langue) has a their own chapel lined along the side of the nave in which they try and outdo each other in splendor. The barrel shaped ceiling is a single huge fresco, the lifework of famed artist Mattia Preti. And last but not least the floor is entirely taken by knight's graves all intricately inlaid marble in different colours, a recent book on the subject describes it as the 'most beautiful floor in the world.' This relatively unknown cathedral can count itself one of the most impressive in Europe. Entrance is through the Carappechia Annex on Republic Street in between St John's Street and St Lucy Street, directly opposite the Law Courts. As soon as you enter you will be provided with an audio guide included in the entrance fee which leads you through the cathedral in 24 stops enabling you to get further historical information about the paintings and special parts of St. John’s Co-Cathedral.