21 cathedrals visited by Massimo Gallo

Alexander Nevsky Cathedral

Barcelona Cathedral

Basilica di San Petronio

Catedral de València

Cathedral of Our Lady

Cathedral of St. Michael and St. Gudula

Helsinki Cathedral

Karlskirche

Munich Frauenkirche

Notre Dame de Paris

Saint Stephen Cathedral

Saint Vitus Cathedral

Saint-Peters Basilica

Salzburg Cathedral

Seville Cathedral

St Paul's Cathedral

St. Andrew's Cathedral

St. Mary's Cathedral

St. Peter's Basilica

St. Salvator's Cathedral

Uspenski Cathedral