National Roman Museum - The Baths of Diocletian

About

The National Roman Museum – The Baths of Diocletian stands as a living testament to Rome’s imperial grandeur, one of only a handful of bath complexes that survive largely intact. Erected between AD 298 and 306 under Emperors Diocletian and Maximian, the sprawling 13‑hectare site once welcomed up to 3,000 bathers in a day, featuring frigidarium, tepidarium, caldarium, natatio, palestra, and a monumental arch. Today, the ruins house the National Roman Museum, the Basilica of Santa Maria degli Angeli, the Certosa, and a treasury of archaeological artefacts. Situated between the Viminal and Quirinal hills, the complex is easily accessible from Rome’s Termini station and Piazza della Repubblica. The site is open Tuesdays through Sundays from 9:30 am to 7:00 pm, with ticket sales closing an hour earlier, offering a tranquil walk through layers of history that date from the heart of imperial bathing culture to a Renaissance religious sanctuary. Inside the frigidarium lies the Basilica of Santa Maria degli Angeli, a masterpiece of Michelangelo’s design that blends classical Roman architecture with Baroque artistry. The Aula Ottagona, once known as the “planetarium,” showcases an octagonal chamber that once served as a medieval monastery chapel and now hosts scientific exhibitions. For those fascinated by engineering, the Natatio’s 4,000 m² open‑air pool offers a glimpse of ancient water‑management systems. A visit to the Baths of Diocletian is a journey through time, where visitors can wander from the imperial bathhouse remains to the medieval church and contemporary museum displays, all while standing amid the echoes of Roman aristocracy, scholars, and monks who have revered this space for centuries.

Highlights

• Basilica di Santa Maria degli Angeli
• Aula Ottagona (Planetarium)
• Natatio
• Certosa di Santa Maria degli Angeli

Must-See Areas

At a glance

• Typical visit: about 1 hour 30 minutes