Germany
This museum has an impressive array of Roman artifacts that were found along the Rhine. Cologne, while now thoroughly modern, was initially a major Roman city and many remains have been discovered and are on display here. The museum is also built on the ruins of a significant Roman villa with a large Dionysus mosaic on display.
Italy | Sicily
Originally built by the Greeks during the third century B.C., Taormina's Greco-Roman theater was dug into the rock of Mount Tauro. It was later expanded and rebuilt by the Romans. Today, the theater is a fascinating historical site, and it boasts incredible views of Mount Etna to the southwest and the Ioania sea to the east.
Italy | Sicily
Remarkable historical site containing an ancient quarry, as well as a Greek theater and a Roman amphitheater. We highly recommend hiring a guide, as someone who can tell you in detail about the sites adds a lot to the experience.
France
This is one of the best preserved Roman amphitheaters anywhere. Its arches date back to the first century BC and in its heyday saw its fill of chariot races and battles. It's located right in the center of Arles an is still used regularly - including for local (non lethal) bull "fights".