Tophane (Turkish pronunciation: [topˈhane]) (lit. "Armoury") is a quarter in the Beyoğlu district of Istanbul, Turkey, running downhill from Galata to the shore of the Bosphorus where it joins up with Karaköy to the southwest and Fındıklı to the northeast.
In the Ottoman era, it was the city's first industrial zone.
The Nusretiye Mosque (Turkish: Nusretiye Camii) is an ornate mosque located in Tophane district of Beyoğlu, Istanbul, Turkey. It was built in 1823–1826 by Sultan Mahmud II.
Karaköy (Turkish pronunciation: [kaˈɾakøj]), the modern name for the old Galata, is a commercial quarter in the Beyoğlu district of Istanbul, Turkey, located at the northern part of the Golden Horn mouth on the European side of Bosphorus.
Karaköy is one of the oldest and most historic districts of the city, and is today an important commercial center and transport hub. It is connected with the surrounding neighborhoods by streets radiating out from Karaköy Square. The Galata Bridge links Karaköy to Eminönü to the southwest, Tersane Street links it to Azapkapı to the west, Voyvoda Street (Bankalar Caddesi) links it to Şişhane to the northwest, the steeply sloping Yüksek Kaldırım Street links it to Pera in the north, and Kemeraltı Street and Necatibey Street link it to Tophane to the northeast.