The round mausoleum built for Constantine's daughter Constantina (died 354) keeps its 4th-century ceiling mosaics, one of the best-preserved Late Antique interiors in Rome; next door, the 7th-century basilica of Sant'Agnese still has its original apse mosaic of St Agnes and Pope Honorius.
- Address
- Via Nomentana 349, 00162 Roma
- Hours
- Santa Costanza: Mon-Sun 09:00-18:00 (Google hours via Wanderlog, 2026-09); Sant'Agnese: Mon-Sun 07:30-12:00, 15:00-19:30
- Best time to go
- Morning, Afternoon · About 1 h
- Price
- Free (church)
- Price level
- €
Details can change. Check hours and prices before you go.
Good to know
- You enter Sant'Agnese down a long staircase lined with inscriptions from the catacombs below.
- The Catacombs of St Agnes under the church are visited from the same complex.