The most "city" capital in the world: Istanbul.

If there is a city worth spending many days in, Istanbul is definitely a good choice. Istanbul, formerly known as Constantinople, is the economic, cultural, and transportation center of Turkey. It is located at the eastern end of the Balkan Peninsula, on the west bank of the southern mouth of the Bosporus Strait, and at the entrance to the Black Sea. It is a key transportation hub between Europe and Asia, with a strategically important location. The city spans both Europe and Asia, with a rich historical and cultural heritage and beautiful natural scenery. It was once the capital of the Roman Empire, the Byzantine Empire, and the Ottoman Empire, and therefore has many world-famous historical sites. Istanbul's history can be traced back to 658 BC, when Greek immigrants established a city on the promontory between the Golden Horn and the Sea of Marmara, called Byzantium. In 330 AD, the Roman Emperor Constantine the Great moved the capital here and named it New Rome, later renamed Constantinople. In 1453, after the Ottoman Empire conquered Constantinople, it was renamed Istanbul and has been used ever since. Istanbul is not only the largest city in Turkey, but also one of the world's most famous tourist destinations. Its historic district was listed as a UNESCO World Heritage Site in 1985, showcasing the blending of diverse cultures and religions. The city's main attractions include the Hagia Sophia, Topkapi Palace, Suleymaniye Mosque, and the Blue Mosque, which attract tourists from all over the world. In addition, Istanbul has a rich culinary culture, with a focus on grilled meats, seafood, pasta, and desserts. Turkish kebabs, Turkish ice cream, and Turkish delight are popular among tourists. Istanbul's unique geographical location, with the Bosporus Strait dividing it into European and Asian districts, makes it the only city in the world that spans both Europe and Asia. The European district is the commercial center, while the Asian district is the residential center. This unique layout makes Istanbul a crossroads of Eastern and Western cultures, religions, and arts.