Notre-Dame de Paris leads Cathedrals at 4,133,700, in France. It is followed by Cologne Cathedral (2,559,161) and Church of the Holy Sepulchre (2,381,813).
Notre-Dame de Paris — 4,133,700 (France)
Cologne Cathedral — 2,559,161 (Germany)
Church of the Holy Sepulchre — 2,381,813 (Israel)
Westminster Abbey — 2,316,405 (United Kingdom)
Milan Cathedral — 1,853,664 (Italy)
Florence Cathedral — 1,574,723 (Italy)
Mosque-Cathedral of Cordoba — 1,027,145 (Spain)
Archbasilica of St. John Lateran — 943,381 (Italy)
St Mark's Basilica — 862,125 (Italy)
Seville Cathedral — 774,748 (Spain)
Cathedral of Our Lady of Strasbourg — 705,752 (France)
Reims Cathedral — 662,795 (France)
Basilica of Saint-Denis — 662,344 (France)
St. Vitus Cathedral — 652,962 (Czech Republic)
Notre-Dame de Chartres — 645,972 (France)
Cathedral of Santiago de Compostela — 579,790 (Spain)
Aachen Cathedral — 514,275 (Germany)
Cathedral of the Holy Cross and Saint Eulalia — 482,077 (Spain)
Canterbury Cathedral — 481,180 (United Kingdom)
Lincoln Cathedral — 425,244 (United Kingdom)
Berlin Cathedral — 416,887 (Germany)
Rouen Cathedral — 379,994 (France)
Siena Cathedral — 373,497 (Italy)
St. Patrick's Cathedral — 369,732 (United States)
Palma Cathedral — 362,493 (Spain)
Pisa Cathedral — 355,465 (Italy)
Notre-Dame d'Amiens — 343,830 (France)
Church of Saint Sava — 335,342 (Serbia)
Kazan Cathedral — 330,688 (Russia)
St. Stephen's Basilica — 309,172 (Hungary)
Washington National Cathedral — 298,785 (United States)
Salisbury Cathedral — 293,355 (United Kingdom)
Frauenkirche — 291,892 (Germany)
Almudena Cathedral — 290,677 (Spain)
Main Cathedral of the Russian Armed Forces — 284,326 (Russia)
Peter and Paul Cathedral — 283,602 (Russia)
Basilica of the National Shrine of Our Lady of Aparecida — 280,037 (Brazil)
Nidaros Cathedral — 276,931 (Norway)
York Minster — 274,376 (United Kingdom)
Abbey of Monte Cassino — 273,555 (Italy)
Mexico City Metropolitan Cathedral — 259,217 (Mexico)
Toledo Cathedral — 257,122 (Spain)
Speyer Cathedral — 255,725 (Germany)
Etchmiadzin Cathedral — 251,235 (Armenia)
Cathedral of St. John the Divine — 251,090 (United States)