The Baths of Caracalla (inaugurated 216 AD) were the second-largest thermal complex in Rome (after the later Baths of Diocletian), covering 25 hectares with a bathing block of 337m × 328m. Up to 1,600 people bathed simultaneously in the caldarium (hot room, beneath a 35m domed ceiling — now collapsed but the walls still stand to full height), the tepidarium, and the frigidarium (cold room — the Farnese Hercules and the Farnese Bull, now in Naples' MANN, were found here). The baths were not just for bathing: they included two gymnasiums, two libraries (Greek and Latin), a garden, shops, and a 1,600m running track. The mosaics survive — geometric and figurative floor mosaics in several rooms are intact and visible from walkways. In summer, the Teatro dell'Opera di Roma stages opera and ballet among the ruins. Rome guide →
Plan my Rome trip →The caldarium: The hot room — circular, originally covered by a 35m dome (larger than the Pantheon's). The walls survive to 30m, giving the scale of the interior. The frigidarium: The cold room — massive cross-vaulted hall where the Farnese sculptures stood. The palaestrae (gymnasiums): Two symmetrical exercise courts flanking the main block — mosaic fragments on the floors. The underground tunnels: A network of service tunnels (where the furnaces, water systems, and slave quarters were) is sometimes visitable with special tours — check coopculture.it. The mosaics: Black-and-white and polychrome floor mosaics survive in the gymnasium areas and some bathing rooms. Opera at the Terme (June-August): The Teatro dell'Opera stages 3-4 productions per summer among the ruins. Tickets €25-150. An Aida with the Caracalla walls as backdrop is unforgettable.
Getting there: Metro B Circo Massimo, then 5min walk south on Viale delle Terme di Caracalla. Bus 118, 160. Tickets: €8. Hours: Tue-Sun 9am to one hour before sunset. Closed Mondays. Duration: 1-1.5 hours. Opera season: Book at operaroma.it (June-August). Combine with: Circo Massimo (5min), Aventine Hill (Keyhole of the Knights of Malta — Piazza dei Cavalieri di Malta, 10min walk — look through the keyhole for a perfectly framed view of St. Peter's dome), Appia Antica (10min walk to the start of the ancient road).