Over the centuries, many cultures have added their mark to Istanbul. Today, you can experience those influences firsthand by exploring its mahalles (neighborhoods). From the holy sites of Sultanahmet and the 19th-century European elegance of Beyoğlu to the high fashion of Nişantaşı, the vibrant cafe society of Kadıköy and the football-loving streets of Beşiktaş, it’s easy to see why travelers say that Istanbul isn’t just one city, but multiple cities within one.