The Abandoned City Hall Subway Stop in New York, U.S.A.
Completed in 1904, City Hall station was the first southern terminal of the first line of the New York City subway. Built to impress New Yorkers with their swanky new mode of transportation, the station featured Roman brick walls, brass chandeliers, and vaulted arches.
It closed in 1945 as it could no longer accommodate the growing ridership, but apparently you can still see it if you stay on the 6 train after its last stop, on its way back uptown.