Istanbul Underground.Part 1. İstanbul Büyük İmparatorluk Sarayı The Great Palace of Constantinopolis
Istanbul (/ˌɪstænˈbʊl/ IST-an-BUUL,[7][8] US also /ˈɪstænbʊl/ IST-an-buul; Turkish: İstanbul [isˈtanbuɫ] (About this soundlisten)) is the largest city in Turkey and the country’s economic, cultural and historic center.