architecture building historical religious Regensburg town city view old town St. Peter's Cathedral cathedral Ursula altar north sanctuary UNESCO cultural heritage world cultural heritage middle ages
Architektur Bauwerk historisch religiös Regensburg Stadt Stadtansicht Altstadt Dom St. Peter Kathedrale Ursula-Altar nördlicher Nebenchor UNESCO Welterbe Weltkulturerbe Welterbestätte Mittelalter
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