The Church of the Holy Polish Brothers Martyrs is a catholic temple which has been elevated to the rank of a sanctuary. It houses the relics of the "Five Saint Polish Brothers". In 1984, Father Popiełuszko celebrated there his last Holy Mass before being abducted and assassinated by members of the Security Service.
The church is located at 3 Jerzego Popiełuszki street, in the Wyżyny district of Bydgoszcz, Poland.
Wikipedia https://en.wikipedia.org/wiki/Church_of_the_Holy_Polish_Brothers_Martyrs,_Bydgoszcz
Coordinates 53°6'4.18" N 18°2'34.683" E
