1950s Posters Uncovered in Tube Station
Not Philadelphian, but very cool. Renovations at the Notting Hill Gate tube station uncovered these midcentury posters in an abandoned hallway. The hallway used to lead to elevators, which were replaced with escalators from 1956 to 1959. These signs have been hidden away from sight for fifty years!
See more photos in this Flickr set.
Notting Hill Gate, Kensington, London [map]