The pneumatic tube system from episode 6 of Questioning Everything. #CapCut #questioneverything #hiddenhistory #pneumatic #history | Question Everything

Beneath the streets of New York City lies the skeleton of one of the most ambitious communication systems in U.S. history: a 27-mile pneumatic mail network that once moved 100,000 letters a day—using nothing but air pressure. From 1897 to 1953, steel canisters shot through underground tubes at 35 miles per hour, connecting 23 post offices across Manhattan and Brooklyn. It was fast, reliable, and nearly invisible to the public. So why did this futuristic mail system vanish? And how did something