Things that I didn't know were "a thing" in NYC:
Fume stacks out of the sewers/subways. Basically a 10ft tall traffic cone cut open at the top.
Umbrella culture is strong here. Businesses have little machines for wrapping them in plastic similar to surgeons with shoes and gloves. There's umbrella rental machines dotted about.
@sethmlarson Also, you never realize how much you've internalized not being in other peoples' way until you have kids, who have no notion of inconveniencing other people and are dubious about transitions like doorways, stairs and elevators.
My youngest son loves walking up and down ramps, so he'll gleefully just walk back and forth on the slight incline at the entrance to a store or restaurant and scream if I make him stop. 😅