The Boros Collection is a private collection of contemporary art by Karen and Christian Boros, which has been on display since 2008 in the Reichsbahnbunker Friedrichstraße in Berlin, Germany. The collection comprises artworks in the mediums of sculpture, photography and painting by international contemporary artists. The works are installed on five floors of the bunker, which the architect Jens Casper transformed into a compendium of individual rooms that interconnect on multiple floors. While some rooms were transformed into classic white cube spaces, others still bare traces of the bunker's lineage when it was used as a prison, storage facility and techno club. Each exhibition in the bunker additionally includes site-specific works that refer to and interact with the various interior spaces and their history.