Buried under buildings, meters of soil, stone and debris, undiscovered testimonies of the 2000-year-old city history still lie undiscovered in Cologne from the time when Cologne was still called Colonia Claudia Ara Agrippinensium. Even centuries later, they are still coming to light during construction work – as in 1941, for example, when the famous Dionysus Mosaic was discovered, with its 1.5 million tiles. Or in 2023 at Neumarkt, when people working in archaeology discovered a Roman bathhouse. Some of it you can see underground or in museums, other parts of it have been preserved above ground – like the old city wall, gates or towers. Cologne remained Roman until the 5th century and the city still has a lot to tell you from those centuries.