The pilgrims' oratory is a small church, with an unusual rectangular shape. The Oratory was built in the 15th century with the specific purpose of a hostel for pilgrims and was consecrated to Saints Anthony the Abbot and James of Compostela. The interior is completely frescoed by the masters Matteo da Gualdo and Pierantonio Mazzastris da Foligno. Andrea d'Assisi, a pupil of Perugino, also worked here.