San Diego is an area in the island’s interior where a hermit lived. The first mention of the hermit on Badija is found in a document dating back to 1368.
The remnants of a small church are recognisable with an area for prayer and a living area right by it. Small areas of land which were farmed and the olive grove that was cultivated confirm the old eremite rule: Pray and work! Ora et labora! In front of the hermitage there is a cleft in the rock in which the hermits gathered and stored rainwater for drinking.