Slightly out of the centre, the Gothic-meets-baroque cathedral is like many things in Sulmona – understated and underrated. The fantastically restored interior guards some precious old artefacts, including a 14th-century wooden crucifix. The highlight, however, is a subterranean room (opened in 2009) containing the relics of hermit turned pope, Pietro da Morrone (1215–96), including his slippers and a piece of his heart.
