Saint.John Co-Cathedral, Valletta, Malta

St John's Co-Cathedral (Maltese: Kon-Katidral ta' San Ġwann) is a Roman Catholic co-cathedral in Valletta, Malta, dedicated to Saint John the Baptist. It was built by the Order of St. John between 1572 and 1577.
The church was designed by the Maltese architect Girolamo Cassar, who was also responsible for the construction of many important buildings in Valletta.

 The painting depicting The Beheading of Saint John the Baptist (1608) by Caravaggio (1571–1610) is the most famous work in the church. Considered one of Caravaggio's masterpieces, the largest canvas he painted and the only painting signed by the painter, the canvas is displayed in the Oratory for which it was painted. Restored in the late 1990s in Florence, this painting is one of Caravaggio's most impressive uses of the chiaroscuro style for which he is most famous with a circle of light illuminating the scene of St John's beheading at the request of Salome.