The cave of San Michele Arcangelo is a natural cavity located on the western slope of Monte Raione in the municipality of Olevano sul Tusciano in the province of Salerno. Inside there is a religious complex of the IX-X century.
The entrance to the cavity is located on a limestone ridge of the mountain, close to the Tusciano river. It is accessed via two paths: one starts from the hamlet of Ariano and the other starts from the hamlet of Salitto. The two paths join just before the cave, ending with a stairway.
The peculiarity of the site is the presence within it of a complex religious structure of particular historical significance, made up of five buildings of considerable value called martyrion, a single hall basilica with frescoes from the Lombard era, two votive aedicules with courtyard, a church and an oratory.