Metro Han , Metropolitan Transportation Authority , IETT Headquarters
Structure in General
Metro Han, the headquarters of Istanbul's Metropolitan Transportation Authority (IETT), has the world's second-oldest subway station, opened as part of "Tünel" (1875) which is the world's second-oldest subway line after London's Underground (1863).
Originally opened as a single-storey subway station in 1875, the building was later modified by a Belgian architecture firm and new floors were added in 1912.
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