There's actually an organization that specializes in tours of Berlin's undergrou...

f_allwein on March 20, 2016 | parent | context | favorite | on: Going underground: who’s behind Berlin’s secret su...

There's actually an organization that specializes in tours of Berlin's underground architecture and offers some interesting guided tours (although they probably wouldn't include the subway bedrooms): http://berliner-unterwelten.de/home.1.1.html