In the war a Roman villa was uncovered next to the cathedral when a bomb shelter was being built.
This was fully excavated later, and rather than try to move the centrepiece, beautiful Dionysus mosaic, an entire museum was built around the site in the 1970s.
The museum also shows off all of the artefacts found around Cologne from the time of Colonia Claudia Ara Agrippinensium, which was the capital of the Germania Inferior province.
