Were Anadoluhisarı and Gül Mosque in Istanbul both constructed by the Ottomans?
Anadoluhisarı Anadoluhisarı (English: Anatolian Castle ), which is historically known as Güzelce Hisar (meaning "the Proper Castle") is a fortress located in Istanbul, Turkey on the Anatolian (Asian) side of the Bosporus, which also gives its name to the quarter around it in the Beykoz district. It was built between 1393 and 1394 by the Ottoman sultan Bayezid I "The Thunderbolt" as part of his preparations for the Second Ottoman Siege of Constantinople, which took place in 1395. Sultan Bayezid built it on the ruins of a temple of Uranus Originally named Güzelcehisar (Turkish: "Beauteous Castle" )
Varda Viaduct The Varda Viaduct (Turkish: "Varda Köprüsü" ), aka Giaour Dere Viaduct, locally known as "Alman Köprüsü" or "Koca Köprü" (literally: "German Viaduct" or "Big Viaduct"), is a railway viaduct situated at Hacıkırı (Kıralan) village in Karaisalı district of Adana Province in southern Turkey. Designed and built by Imperial German engineers as part of the Baghdad Railway (Haydarpaşa Terminal, Istanbul-Baghdad), the stone arch structure is 63 km from Adana Central Station and 306 km from Konya.