The Servites' portico
The Portico dei Servi is located in Piazza Santissima Annunziata, which can be reached from the Duomo by walking along Via dei Servi until you reach the square at the end. The portico is in front of the hospital.
It was built between 1516 and 1525 for the Confraternity of the Servites of Mary. A small chapel is still in use, but at varying times.