Churches and places of worship Abbazia di Santa Calena The Abbey of Santa Calena is one of the oldest Italian abbeys. Built in the late 9th century, it became in medieval times one of the richest and most powerful abbeys in the south. The abbey presents architectural elements of Apulian, European and non-European schools. It is thought that this was an important reception center for pilgrims who in ancient times were heading to Monte dell'Angelo.