18 cathedrals visited by Pavel Kozlovsky

Alexander Nevsky Cathedral

Berlin Cathedral

Cathedral of St. Michael and St. Gudula

Cologne Cathedral

Dormition of the Mother of God Cathedral, Varna

Helsinki Cathedral

Kaliningrad Cathedral

Kazan Cathedral

Milan Cathedral

Notre Dame de Paris

Riga Cathedral

Saint Isaac Cathedral

Saint Stephen Cathedral

Saint-Peters Basilica

Saints Peter and Paul Cathedral

Smolny cathedral

St. Peter's Basilica

Uspenski Cathedral