i went to Philadelphia and here are some photos from my trip.
i believe this was at City Hall. It's a compass, although it looks like an eye with some great big eyelashes.
The next one is at the entrance to the Art Museum.
It's a fountain (although at first i thought it looked like a rock) in a black cube in a circle in an octagon which is in a Keystone, of course, which is in front of 8 posts. At the upper corners you can see the capsules/microphones/U stuffed with pine cone (Attis) like a fleur de lis. This is at the top of the "Rocky steps" which they named after the famous movie "boxer" character who trained on them. It seems he even left his "footprints" and a statue there.
Anyway, i was looking into the word "keystone", thinking of the word "Chi (Key) Rho"
☧ which means Christ, and i think also means resurrection. Chi is pronounced "kai", so the word is actually Cairo as in Egypt. Cairo means Mars and Mars is Ares, also known as Car or Horus the Red. Car as in cart which is a map (cartography or atlas) or a pipe, both of which are the key.
Horus is like horse which is interesting because when you put the P back into Ares you get Paris, who was famous for his Trojan horse and who i suspect is actually Ares.