St John's Co-Cathedral
St John's Co-Cathedral was built in 1573–1578 to designs by Girolamo Cassar as the conventual church of the Knights of St John. Its plain exterior contrasts with a Baroque interior decorated by Mattia Preti, a nave floor of some 400 inlaid marble tombstones of knights, and Caravaggio's Beheading of Saint John the Baptist (1608) in the oratory.
