I'd like to talk a bit about my favorite kind of public transport, an metro. Because for me it seems the most useful, reliable and out of traffic, except Moscow metro, sure. ) I had a chance to look at one of the biggest metropolitain in the world in Paris not so long time ago. It's really amazing, about 380 stations! But in case of design it looks so boring for me, in comparing to the metro in Moscow or St. Petersburg. This way i tryed to find the interesting and nice station generally in Europe using the internet. And i've found one, it's in Stockholm, Sweden. See the photo below. Also i really wondered by the fact that the first metro in the word had been built in India in 1853, and just a ten years later the same happend in London. The most crowded metro not at all in Moscow, as many people think, but in Tokio. If smb never seen this, just look this link. The biggest metro in NY city with 468 stations, and the smallest in Volgograd (2 stations).
The photos in order: "Notting hill gate" (London), "Komsomoskaya" (Moscow), "High street Brooklyn" (NY), "Ploshad vosstaniya" (Petersburg), "Avtovo" (Peterburg), "Сentralen" (Stockholm) and "Rinkeby" (Stockholm).
More information about metro is here.