Santa Maria foris portas

The church of Santa Maria foris portas, situated in Castelseprio, Italy, is the oldest building that has survived the destruction and abandonment of an ancient fortified town. This single-nave, rectangular church, built around the second quarter of the ninth century, has three equal absides, except for the placement of windows. Nearby excavations revealed adjacent buildings, possibly the private residences of counts and gastalds of Seprio. A ditch was found nearby, linked to another artificial ditch to the south and a valley to the east. A large Carolingian tomb was also discovered nearby, suggesting a burial area for local feudal lords. The church has a rustic simplicity, with a large archway leading to an atrium constructed in the 17th century. The frescoes date back to the early medieval period. The interior may have had marble inlays on the floor, like basilicas in Milan.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons