杜乃爾

Also known as F2 (Istanbul Funicular), F2 (Karaköy – Beyoğlu) Historical Tunnel Funicular Line, Karaköy – Beyoğlu Historical Tunnel Funicular Line

thumb|Galata 1922 map showing the route of the Tünel thumb|Built between 1912 and 1914, the Metrohan Building (Beyoğlu station) is the northern terminus of the Tünel. It is located at Tünel Square, near the southern end of [[Istiklal Avenue.]] thumb|Demolition of the old Tünel Building in Karaköy (southern terminus of the Tünel, near [[Bankalar Caddesi), c. 1968, before it was replaced by the current Karaköy station building.]]