One of the most interesting things I discovered upon my recent visit to Madrid is Bibliometro.
Bibliometro is a project in which Library kiosks are to be found within 12 of the Madrid metro stations.
There are not many books which are held within these library kiosks, but you can order and return library books at these outlets while on your way to or return from work.
By all accounts this is a project which was first developed within Chile.
It is an interesting project which might be well worth developing within many other parts of the world.