I remember when I was a kid and the new subway line opened in Stockholm. Before it opened, you could visit some of the stations and walk around more freely, without the fear of being run over by a train. The new line was like an art installation, and my father and I was curious, so we went.
When the line finally opened, we spent a day stopping at every station; and looking around at all the artwork. This is over 40 years now and most of the underground stations in Stockholm subway has been updated and renovated since then.
The idea has continued though. Why must a subway ride be boring, why can’t it be a very long art project. So, if you ever come to Stockholm, get a subway pass and start looking around.