The Roman Thermal Baths can be visited
Roman Bath Viehmarktthermen Augusta Treverorum (Treves)

The Roman Forum Baths in Trier are the oldest thermal complex in the Roman city of Augusta Treverorum. Located beneath today's Viehmarkt (Cattle Market), they give insight into Roman daily life and the engineering skills of that era.
History+
Around 80 AD, the Romans began construction of this thermal complex, which was completed approximately 20 years later. It was the first of its kind in Trier, predating the Barbara Baths and Imperial Baths. The complex was designed so that the warm bath received optimal light from the south, while the cold bath was located in the north. The 8364 m² thermal complex experienced its heyday in the 3rd and 4th centuries. After the decline of Roman Trier, the baths fell into disuse and even served as a quarry in the 13th century. In the 17th and 18th centuries, the Capuchin order erected buildings over the eastern part of the ruins and used the rest for a monastery garden. After the dissolution of the monastery in 1802, the Viehmarkt (Cattle Market) was established here.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 49.7527, 6.6377