Trier Imperial Baths

The Trier Imperial Baths (Kaiserthermen) are among the most impressive Roman ruins north of the Alps. Begun around 300 AD as a monumental bathhouse for the imperial residence of Trier, they were never finished as baths and later became barracks, a castle and part of the city walls. Since 1986 they have been part of the UNESCO World Heritage Site "Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier" – and their underground service tunnels make a visit unforgettable.

Why Trier's baths matter

In late antiquity Trier – Roman Augusta Treverorum – rose from a prosperous trading town to one of the capitals of the Western Roman Empire. Toward the end of the 3rd century, Emperor Constantius Chlorus launched a vast palace district here, and the baths were planned as an imperial gift to the citizens. Work stopped around 316. When construction resumed later in the 4th century, the complex was turned into barracks, probably for the emperor's mounted guard.

The ruins never disappeared: in the Middle Ages a castle was built inside them, and the walls became a corner of the city fortifications with a gate known as the Altport. Excavations began in the 19th century, and parts of the east apse were stabilized and reconstructed in 1983–84.

What to see

The complex measured roughly 250 by 145 meters (820 by 475 feet), and some walls still rise up to 19 meters (62 feet).

• The caldarium and east apse: tall arched windows in alternating limestone and red brick – the classic photo.
• Underground tunnels: a network of service passages beneath the baths that you can walk through, a highlight for kids and adults alike.
• Viewing point: look across the ruins and the former imperial palace district toward the Basilica of Constantine.
• Exhibition and film: an animation explains how Trier became an imperial residence.

A multimedia guide is available in English, as well as German, French and Dutch.

Opening hours and tickets

As of October 2026, the baths are open daily 9 a.m. to 5 p.m. in October, 9 a.m. to 4 p.m. from November through February, 9 a.m. to 5 p.m. in March and 9 a.m. to 6 p.m. from April to September. Last entry is 30 minutes before closing. Closed on Carnival Monday (Rosenmontag), December 24–26, December 31 and January 1; bad weather can cause short-notice closures.

Admission is €6 for adults, €5 reduced and €3 for ages 6–17; children under six are free. If you plan to see several Roman sites, the AntikenCard is the better deal: €18 (Basic) covers two Roman monuments of your choice plus the Rhineland State Museum, while €28 (Premium) covers the Porta Nigra, Imperial Baths, Amphitheater, Viehmarkt Baths and the museum. Each card is valid for one adult with up to four children through the end of the calendar year.

How to get there

Trier lies on the Moselle River near the Luxembourg border, about 45 km (28 miles) from Luxembourg Airport and roughly 190 km (120 miles) from Frankfurt or Cologne. Regional and long-distance trains serve Trier Hauptbahnhof; regional trains within Germany are covered by the Deutschlandticket. From the station, buses 2 and 30 stop right at Kaiserthermen. Drivers can park in nearby lots such as Gerberstraße (300 m), Palastgarten (450 m) or the Basilika garage on Mustorstraße (600 m).

Is it worth visiting?

Yes – especially as part of a full day exploring Roman Trier, Germany's richest concentration of ancient monuments. Allow 60 to 90 minutes for the baths, wear sturdy shoes for the uneven ruins, and pair your visit with the Basilica of Constantine and the State Museum next door. Dogs are allowed on a leash outdoors but not inside buildings.

Nearby

• Basilica of Constantine and Electoral Palace: the colossal Roman throne hall and a pink Rococo palace, side by side.
• Rheinisches Landesmuseum Trier: one of Germany's leading museums of Roman archaeology, steps away.
• Roman Amphitheater: an arena with cellars on the eastern edge of the center.
• Porta Nigra and Trier Cathedral: the best-preserved Roman city gate north of the Alps and Germany's oldest cathedral, a pleasant walk through the old town.