The number of tourists started to increase since the year 2000, when Serbia started to open to Western Europe and the United States. Every year, in the beginning of July, during the annual EXIT music festival, the city is full of young people from all around Europe. In 2005, 150,000 people visited this festival, which put Novi Sad on the map of summer festivals in Europe.[22] Besides EXIT festival, Novi Sad Fair attract many business people into the city; in May, the city is home to the biggest agricultural show in the region, which 600,000 people visited in 2005.[23] There is also a tourist port near Varadin Bridge in the city centre welcoming various river cruise vessels from across Europe who cruise on Danube river. The most recognized structure in Novi Sad is Petrovaradin fortress, which dominates the city and with scenic views of the city. Besides the fortress, there is also historic neighborhood of Stari Grad, with many monuments, museums, caffes, restaurants and shops. There is also a National Park of Fruška Gora nearby, approx. 20 km from city centre