always great importance in the region. The first to take advantage of it was the Roman Empire that built the important road Via Militaris, linking the city with Singidunum (current Belgrade) to the North and Constantinople (current Istanbul) to the southeast. Nowadays, the city is connected by the highway E75 with Belgrade and Central Europe in north, and Skopje, Thessaloniki and Athens in the south. The road E80 connects Niš with Sofia, Istanbul towards the Middle East, and Pristina, Montenegro and the Adriatic Sea to the West. The road E771 connects the city with Zaječar, Kladovo and Drobeta-Turnu Severin in Romania. The city is also a major regional railway junction linking Serbia to Sofia and Istanbul. The Niš Constantine the Great Airport is the second most important airport in Serbia. The first airfield serving the city of Niš was established in 1910, near the village of Donje Međurovo. In the 1930s then-national airline company Aeroput used the airport for civil service. In 1935 Aeroput included a stop in Niš in its route linking Belgrade with Skoplje. The city public transportation consists nowadays of 13 bus lines. A tram system existed in Niš between 1930 and 1958. Niš Bus Station is the city's largest and main bus station which offers both local urban and intercity transport to international destinations. The largest intercity bus carrier based in the city is Niš-Ekspres, which operates to various cities and villages in Serbia, Montenegro, and Bosnia and Herzegovina. Culture Theatre Niš is a home of the National Theatre in Niš, that was founded as "Sinđelić" Theatre in 1889. Music From 1981 Niš is the host of Nišville International Jazz music festival which begins in mid-August and lasts for 4 days. Galija, Kerber and Eyot are considered the most notable music bands to have originated from Niš. Other notable Niš music acts include Daltoni, Dobri Isak, Lutajuća Srca, Mama Rock, Hazari, Novembar, Trivalia and others. Tourism Tourist sites Čegar – The place where the Battle of Čegar took place on May 19, 1809. Crveni Krst concentration camp – One of the few preserved Nazi concentration camps in Europe. It is on February 12 Boulevard. Memorial to Constantine the Great – built in the city centre in 2013, in commemoration to Constantine the Great who was born in the city, on the anniversary of the Edict of Milan. Bubanj – Monument to fallen Yugoslav World War II