Welcome to the abandoned train stations of the world. You've stumbled into the wrong tunnel. Literally.
Did you know that Platform 14 at the New York City Subway has a secret entrance hidden behind a bookshelf in a hipster cafe? Learn more
Or, did you know that the Paris Metro has a station that only appears on Sundays during leap years? Read on
And, if you're feeling particularly daring, try to find the secret underground bunker at the Tokyo Metro. Take a risk