Kaiserdom Cathedral, UNESCO World Heritage Site, Speyer, Rhineland-Palatinate, Germany, Europe

View over Main River to Eiserner Steg iron footbridge and Kaiserdom Cathedral of St. Bartholomew, Frankfurt, Hesse, Germany, Europe

View from Kaiserdom Cathedral St. Bartolomew over Romerberg to Paulskirche Church and the skyline of Frankfurt am Main, Hessen, Germany, Europe

View over Main River to the financial district skyline, Kaiserdom cathedral, Paulskirche church, Frankfurt, Hesse, Germany, Europe

View from Maximilian street at Speyer cathedral, Rhineland-Palatinate, Germany, Europe

Skyline and banking district at sunset, twilight, Taunus Tower, Tower 185, Commerzbank, Messeturm, HelaBa, Hessische Landesbank, Deutsche Bank, Kaiserdom, Floesserbruecke, Frankfurt am Main, Hesse, Germany, Europe

Kaiserdom St. Bartholomäus, Dome of Saint Bartholomew, Domeplatz, Frankfurt am Mein, Frankfurter skyline, Frankfurt, Hesse, Germany, Europe

Golden bust of Charlemagne on display in the Domschatzkammer, the Treasury of Aachen Cathedral, Aachen, Germany

Interior of the octagonal Palatine Chapel, built by Charlemagne, Aachen Cathedral (Kaiserdom), Aachen, Germany