"The church of Saint Agnes Outside the Walls is a titulus church, minor basilica in Rome, on a site sloping down from the Via Nomentana, which runs north-east out of the city, still under its ancient name. What are said to be the remains of Saint Agnes are below the high altar." Wikipedia.
A set of wide marble steps leads you up from the back of the nave, past hundreds of fragments of early memorials, to a courtyard with more fragments, and then on to Santa Costanza.
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