Atlas Obscura
Santa Costanza in Rome, Italy
Located three Roman miles outside Rome's ancient walls, the Mausoleum of Constantina (Santa Costanza) might just be one of the Eternal City's most unique yet underrated churches. Originally built around 350 by the Emperor Constantine to house the remains of his daughter Constantina, it was part of the much larger Basilica of Saint Agnes, only a small portion of which remains today. Santa Consta…
Circular plan, common among ancient Roman mausoleums