Trier was a capital of the Roman Empire and has ruins of Roman baths and a 20,000 seat amphitheatre. There's even a palace building used by Emperor Constantine as a throne and audience hall which now serves as a Protestant church! In more recent times, Trier was the birthplace of Karl Marx, perhaps the city's most famous, or maybe infamous, native born resident. #RomanEmpire #KaiserThermen #TrierAmphitheater #AulaPalatina #KonstantinBasilika #KarlMarxHouse #Trier #RhinelandPalatinate #Germany