Originally Posted by
NYBanker
This one is quite large. At present, you can go from 6th and 52nd (the UBS building) to 5th and 48th completely indoors. Prior to 9/11, you could go an extra block up to 6th and 53rd (1301 6th).
Yes, I tested this out; there was a deli on 53rd that extended the passage to mid-block.
When the weather outside is "frightful"

it is so "delightful"

to get from point A to point B (if you know the (secret) passageways).
PS: Grand Central had more stuff that doesn't exist now--but they did add the track passageways getting as far north as 47th Street.