Germany, Hesse, Frankfurt on the Main, Old opera, facade, detail, U-Bahnhaltestelle Series, Europe, city, Main metropolis, metropolis, sight, buildings, construction, opera house, style, sp?tklassizistisch, built means of transportation 1873-1880, Architect Richard Lucae, architecture, art, culture, clock, stop, subway, publicly, street of the emperors and kings