The largest baths of antiquity

The Baths of Diocletian were ancient Rome's largest baths: a colossal complex built between 298 and 306 AD that could welcome thousands of people at once. They sit just steps from Termini station, facing Palazzo Massimo, and today they form a fascinating place where Roman archaeology, a church by Michelangelo and a branch of the National Roman Museum all come together.

Few monuments capture Rome's grandeur and constant transformation so well: what was once a bathing hall became a Renaissance basilica, and the ancient rooms now hold sculptures, inscriptions and cloisters.

One complex, three experiences

Visiting the Baths of Diocletian means discovering three things in a single place:

  • The remains of the Roman baths, with their monumental halls.
  • The Basilica of Santa Maria degli Angeli e dei Martiri, carved by Michelangelo out of the ancient frigidarium (the cold-water hall).
  • The branch of the National Roman Museum, home to the epigraphic collection, the protohistory section and the great Michelangelo cloister.

Michelangelo's basilica

The "hidden" heart of the complex is the Basilica of Santa Maria degli Angeli e dei Martiri, designed by Michelangelo in his final years, making use of the immense vaults of the baths' ancient frigidarium. Stepping inside takes you, in an instant, from ancient Rome to the Renaissance, into a space of extraordinary scale. Entry to the basilica is free. We cover it in a dedicated guide: Michelangelo's Santa Maria degli Angeli.

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The National Roman Museum

The Baths of Diocletian section is part of the National Roman Museum (along with Palazzo Massimo, Palazzo Altemps and Crypta Balbi). Here you'll find Italy's most important epigraphic collection (inscriptions that tell the story of Roman life), the protohistory section and the great Michelangelo cloister, filled with ancient sculptures. You'll find the details in our guide on what to see at the Baths of Diocletian.

How much time you need

The basilica (free) takes just 15-20 minutes; for a full visit of the museum and cloisters, allow about 1–1.5 hours. It pairs perfectly with Palazzo Massimo (right across the way) and the other branches of the National Roman Museum, thanks to the combined ticket.

Frequently asked questions

What are the Baths of Diocletian? They were ancient Rome's largest baths, built between 298 and 306 AD. Today the complex houses Michelangelo's basilica (Santa Maria degli Angeli) and a branch of the National Roman Museum.

Is it true there's a church by Michelangelo inside the baths? Yes: the Basilica of Santa Maria degli Angeli e dei Martiri was designed by Michelangelo, making use of the baths' ancient frigidarium. Entry to the basilica is free.

Are the Baths of Diocletian part of the National Roman Museum? Yes, they're one of its four branches (along with Palazzo Massimo, Palazzo Altemps and Crypta Balbi). A combined ticket includes them all.

How much time do I need for the visit? About 1–1.5 hours for the museum and cloisters; 15-20 minutes if you only visit the basilica (free).

Are they close to Termini station? Yes, they're in Piazza dei Cinquecento, just steps from Termini and right across from Palazzo Massimo.

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Article #327 · Category: Monuments · Updated: May 2026