Worth the visit—our modern day stadiums are based on this design! Another cool Roman site that is actively being studied. Just like the Porta Nigra and Kaiserthermen, this site also cost 4 or 5 Euro. The site has three levels, only the arena floor is ADA accessible. At the arena floor are several rooms for entrance to the seating and rooms for holding stuff then and now. From here you can see the seating circling around the arena and you can go up into the stands on one side—it is steep stairs with no protection so mind your step for sure. From the arena floor you can get under the arena to see the workings of where they kept animals and combatants or brought up equipment, that was very interesting (bring a flashlight). The amphitheater is across the busy street from the Kaiserthermen, not even a full kilometer walk. There is a tunnel that takes you under the street safely and or you can take a pretty bike path.