My favorite Paris metro station...

... Is Concorde. It connects multiple lines - including the 1 (Marais/
St. Paul, Bastille, Louvre) and the 12 (Abbesses/Montmartre, Pigalle).
It also places you right by the Musee d'Orangerie and a beautiful
gardens. More importantly for purposes of admiration, the walls and
ceiling are tiles of letters, like a giant word find.