There are some remnants of NYC's 27-mile pneumatic tube mail network still viewable to the intrepid, but this 1908 map reveals the network's extent, the promise it once held and how some destinations on the route have evolved.
We previously looked into the green relay mailboxes in a Cities 101 article. They’re temporary holding spots for letter carriers
What are those green mailboxes on the streets of New York City? In the latest Cities 101 we dig into these boxes, known as relay boxes.
Untapped Cities reader g1g1_nyc submitted this #DailyWhat of a "mailbox for birds" about 9 feet up on a tree in Union Square.