Albenga Baptistery (church building) built
401 CE.
Shown on the map at 44.049°, 8.213°.
The Baptistery of Albenga is a paleochristian religious structure in Albenga, province of Savona, in the region of Liguria of northern Italy. It is an example of 5th-century late-Ancient Roman architecture with mosaic decoration, and stands adjacent to the Albenga Cathedral of San Michele Arcangelo.
Text from the Wikipedia article Albenga Baptistery, licensed CC BY-SA 4.0.