Landmarks & buildings
Olaus Petri Church
Olaus Petri Church is named as a filming location of Where Once We Walked by a published source, listed below with its publisher and its sentence. No wiki records a shoot here yet.

From published sources
Newspapers, film offices, archives and city filming permits say these were filmed at Olaus Petri Church. Each source is linked.
Filming locations nearby
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Streets & squares
Oksasenkatu
Finland · under 1 km
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Streets & squares
Runeberginkatu
Finland · under 1 km
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Landmarks & buildings
Pohjoinen Hesperiankatu 9
Finland · under 1 km
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Streets & squares
Museokatu
Finland · under 1 km
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Landmarks & buildings
Välskärinkatu 1b
Finland · under 1 km
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Landmarks & buildings
Välskärinkatu 5
Finland · under 1 km