Thessaloniki has about 800,000 inhabitants in its metropolitan area and about 320,000 within its city limits. The city is located in the Central Macedonia region and is the capital of the region. Thessaloniki is the second largest city in the country. It has a history that dates back more than 3,000 years and has a number of ruins from the eras of the Romans, Ottoman and Byzantine. There are a number of ruins that are listed on the UNESCO World Heritage Sites. A number of festivals and events attract tourists from all over the world to this lovely city. Thessaloniki is known for its lively cultural life and is considered the capital of culture for Greece. It has its own International Film Festival and Trade Fair. The city is home to Aristotle University, the largest university in Greece and all of the Balkans. The city is Greece's second largest industrial, economic and commercial center.