The church used to be a home to Catholic immigrant workers. Nowadays it holds an exhibition of the popular football club Borussia Dortmund.
Wikipedia (German) http://de.wikipedia.org/wiki/Dreifaltigkeitskirche_(Dortmund)
Info https://www.dortmund-tourismus.de/en/discover-dortmund/sightseeing/buildings/poi/dreifaltigkeitskirche.html
Address Flurstraße 10, 44145 Dortmund, Germany
Coordinates 51°31'34.126" N 7°29'6.695" E