They are comically old cars, some you have to open by flipping a lever down with a snap (and from inside you can actually open the door before the train comes to a complete stop).  And they are color coded in weird secondary colors like light yellow and slightly darker yellow as well as a light green yellow line. I am talking of course about the Metro which whiz below Paris with open windows that alllow for an impressive breeze.  We had our struggles today and a couple times the train let us down (note: not every connection is clearly marked). But oh the places it took us.  Paris for us was not love at first sight but we are now officially smitten. 

Locks sold by street vendors and no more room on bridge for them

On the man made beach banks of the River Seine

That is a lot of people looking at the Mona Lisa!