There are a lot of beautiful subway stations all over the world. For a quick example I recommend you to do a quick Google image search on the subway in Moscow. In Oslo they have also used some resources on beautification. Last night my girlfriend and I happened to walk in one of the tunnels down to the railway and subway station at "Nationaltheatret" station in Oslo, and we were alone down there. I did not bring my tripod or my SLR camera, but my G9 was put to the test.