This is just beautiful.

Artist Hwan Lee has walked (yes, walked!) to 261 Métro stations in Paris, sketching their many and varied entrances, from the spectacular Hector Guimard-designed Art Nouveau édicules at Abbesses and Porte Dauphine to the more prosaic entrances of the modern Ligne 14. The lively sketches of each entrance are arranged nicely onto a stylised Métro map, with Lee’s walking path denoted by a trail of feet all over the city. Delightful!

Source: Hwan’s Behance profile