This 20 Pfennig commemorative stamp, issued by the Deutsche Bundespost in 1961, celebrates the 900th anniversary of the Kaiserdom zu Speyer (Imperial Cathedral of Speyer) — one of Germany’s most important Romanesque architectural landmarks and a UNESCO World Heritage Site. The striking red design features a stylized depiction of the cathedral’s massive towers and nave, symbolizing imperial grandeur and medieval craftsmanship. The issue honors the cathedral’s enduring legacy as the burial site of several Holy Roman Emperors and a masterpiece of 11th-century architecture.