Sudbahnhof Ruins by yooperprof
Mainz is the location of one of the most important Roman archeological projects: the excavation of a major Roman theatre located on the grounds of the Sudbahnhof rail station. The site was discovered in the middle of a major renovation/expansion project at the train station, and is still very much on-going. This is one place where you can witness a very important historical process while you are changing trains! It's a particularly important project, because it demonstrates the willingness and ability of the Roman Empire to provide the comforts of "civilization" for its soldiers and administration, even in the midst of "barbarian" Germany.
A series of interpretitive markers provide helpful explanations of the dig in both German and English.