Located only 163 kilometers from Sofia, Nis is a fantastic option to add a Serbian stamp in your passport, without checking out from your hotel in Bulgaria. Nis is the third largest city in Serbia and the birthplace of Constantine the Great, one of the most important emperors in the Roman history. Explore the intriguing history of former Yugoslavia, while having delicious authentic Serbian roshtil (grill) either in a traditional restaurant where you can pay with a card (plenty of vegetarian and vegan options available) or try the Serbian street food.