Context : The Aachen Altar (de: Aachener Altar) or Passion Altar (Passionsaltar) is a late gothic passion triptych in the Aachen Cathedral Treasury, made by the so-called Master of the Aachen Altar around 1515/20 in Cologne, Germany. 
Question : What is the name of the place where Aachen Altar can be found?
Aachen Cathedral Treasury