St John's Co-Cathedral & the Caravaggio masterpieces
A 5-10 minute walk from the cruise terminal opens onto the most gob-smacking high-Baroque interior in the Mediterranean: every surface drips carved gold, the floor is a carpet of 400 inlaid-marble knight tombs, and the Oratory holds the only painting Caravaggio ever signed -- the monumental 'Beheading of Saint John the Baptist.' Skipping this is effectively skipping Valletta. Buy the timed ticket online to skip the line; closed Sundays, last admission ~16:15, no flip-flops or sleeveless tops.