Istanbul
Located at the junction of Europe and Asia, on both sides of the Bosphorus Strait, Istanbul, Turkey's largest city, is the only city in the world to straddle two continents. Its Old Town, New Town, and Asian side have a combined population of 14 million, making it the sixth largest city in the world. Having endured nearly a thousand years of rule by the Byzantine Empire (Eastern Roman Empire) in the Christian world and over five centuries by the Ottoman Empire in the Muslim world, Istanbul boasts numerous historical sites, churches, and mosques, making it a world-renowned tourist destination with a rich cultural heritage and abundant tourist resources.
To truly explore Istanbul, I think it would take at least a month. However, I suspect most travelers don't have the luxury of such a long trip for such an in-depth tour. We've condensed Istanbul's famous attractions into five days, allowing you to fully explore and experience this ancient city.