First, one finds the TOP 25 of the best pictures. Then, there is a TOP 5 of the stations according to three criteria: architectural, artistic, pictorial. Finally, a small selection of the "must see" stations which stand out by a particular aspect.
The text link will get you to the station. You may get back here by clicking on this button: 
I would like to say that the selection was tough! The site contains no less than 319 pictures distributed in 65 stations! If you think that a particular picture or station should be mentioned on that page, let me know about it!
Click on the thumbnail to open the picture in a new window. The text link will send you to the station.
The pictures are in 1024 x 768 resolution (about 130 Ko), so you may use them as wallpapers if you like.