Istanbul is Turkey's most populous city, and its cultural and financial center. The city has many architecturally significant entities, please see the list of architectural structures in Istanbul. Throughout its long history, Istanbul has acquired a reputation for being a cultural and ethnic melting pot. As a result, there are many historical mosques, churches, synagogues, palaces, castles and towers to visit in the city. Daily life in Istanbul is colorful and vibrant and continues to bustle side by side with many carefully protected Roman, Byzantine and Ottoman monuments. Istanbul is often considered the capital of Turkey in terms of commerce, entertainment, culture, education, shopping, tourism and art. For those who enjoy night life, there are many night clubs, pubs, restaurants and taverns with live music. The night clubs, restaurants and bars increase in number and move to open air spaces in the summer. The areas around Istiklal Avenue and Nisantasñ offer all sorts of cafes, restaurants, pubs and clubs as well as art galleries, theaters and cinemas.