The Basilica di San Prospero occupies its own small piazza just west of Piazza del Duomo and has an imposing late-Renaissance facade finished in 1546. The six lions flanking the church entrance give the square an unexpectedly bold character — they are thick-maned and alert-looking, more heraldic than naturalistic. The campanile behind the facade is an early medieval tower that was incorporated into the later structure.
Inside, the church is richly decorated with sixteenth-century frescoes and paintings by local and regional artists. The most notable is a large canvas by Camillo Procaccini near the high altar. The sacristy preserves wooden choir stalls of considerable quality. The church remains active, so visiting hours are governed by services; mornings are the most reliably accessible time.