Thessaloniki is the second largest city in Greece and the capital of the region of Central Macedonia, as well as the capital of the Decentralised Administration of Macedonia and Thrace. The city is renowned for its festivals, events, and vibrant cultural life in general, it is also considered to be Greece´s cultural capital. Events such as the Thessaloniki International Trade Fair and the Thessaloniki International Film Festival are held annually, while the city also hosts the largest bi-annual meeting of the Greek diaspora. Thessaloniki is home to numerous notable Byzantine monuments, including the Paleochristian and Byzantine monuments of Thessaloniki, a UNESCO World Heritage Site, as well as several Roman, Ottoman and Sephardic Jewish structures. The city´s main university, Aristotle University, is the largest in Greece and the Balkans. The earliest known letter by Paul the Apostle was written to the early Christian church in Thessaloniki and is identified as First Thessalonians; it is among the books in the New Testament whose authorship by Paul is generally regarded by scholars as being undisputed. A later letter to the same church follows in the Christian Bible as Second Thessalonians. In addition to its historic roots, Thessaloniki is also a very popular tourist destination in Greece. In 2010, Lonely Planet ranked Thessaloniki as the world´s fifth-best party city worldwide, comparable to other cities such as Dubai and Montreal. For 2013, National Geographic Magazine included Thessaloniki in its top tourist destinations worldwide. If that’s not enough to tempt you, it was the second largest and wealthiest city of the Byzantine Empire.