Serbia sits at a crossroads in the Balkans, and it shows in a country that mixes Ottoman and Austro-Hungarian history, a nightlife scene built around riverboat clubs, and a river gorge that rivals anything in Western Europe without the crowds. The best places to visit in Serbia range from the capital’s fortress overlooking two rivers to a mountain resort town, and the country is compact enough to see a serious cross-section of it in a week to ten days. This guide covers five stops worth the trip, plus how to set up a phone connection before you land in a country that sits outside the EU roaming zone.
Belgrade sits where the Sava River meets the Danube, and Kalemegdan Fortress, right at that meeting point, has been fought over and rebuilt for close to two thousand years by whoever controlled the region at the time. The park surrounding it makes for one of the better sunset spots in the city, watching the two rivers converge below. Skadarlija, the old bohemian quarter with cobblestone streets and traditional restaurants, is where Belgrade’s older character still shows through the newer parts of the city. Belgrade’s nightlife runs late even by regional standards, particularly the floating clubs along the riverbanks in summer.
Novi Sad, about an hour north of Belgrade by train, moves at a noticeably slower pace than the capital. Petrovaradin Fortress, sometimes called the Gibraltar of the Danube, sits across the river from the old town and is riddled with underground tunnels that once housed a garrison. The city is best known internationally as home to the EXIT Festival every July, but outside festival season it works well as a relaxed day trip or overnight stop, with a walkable old center and a clock tower with an intentionally mismatched hour and minute hand.
Nis does not get the same attention as Belgrade or Novi Sad, which is part of its appeal. Nis Fortress, an Ottoman-era structure built on top of earlier Roman foundations, sits right in the center of the modern city and is free to wander through. The Skull Tower, a more sobering site built from the skulls of Serbian rebels after a battle in the early nineteenth century, is a stark piece of history that most visitors to Serbia never see because it sits outside the usual Belgrade-focused itinerary. Nis is also the birthplace of Constantine the Great, a fact the city does not let visitors forget.
Zlatibor is where Serbians themselves go for a mountain break, a resort town in the west of the country surrounded by pine forest and rolling hills. The pace here is built around walking, small farms selling local cheese and cured meats, and, in winter, modest skiing compared to the Alps but still enough for a couple of days on the slopes. The nearby Sargan Eight, a narrow-gauge heritage railway that loops through the mountains in a figure-eight pattern, is worth the half day trip on its own.
Djerdap National Park, along Serbia’s border with Romania, contains the Iron Gate Gorge, where the Danube narrows and cuts through the Carpathian Mountains, creating cliffs that rise directly from the water. The Tabula Traiana, a Roman inscription carved into the rock face to commemorate a bridge built under Emperor Trajan, is visible from a boat and one of the oldest Roman monuments still in its original location anywhere on the river. This is a full day trip from Belgrade, further if you are basing from Nis, but it is one of the more dramatic landscapes in the country and rarely crowded.
Serbia is not part of the EU, so a home SIM from most European countries loses the free-roaming treatment the moment you cross the border, and non-European travelers face standard international roaming rates from the start. A Serbia eSIM works as a local connection from the moment you land, avoiding both problems without needing to find a carrier shop in an unfamiliar city.
GleeSim sets this up over WhatsApp before you fly. Message the number with your rough plans, whether that is a Belgrade city break or a longer loop through Novi Sad, Nis, and Djerdap, and a plan gets suggested along with a QR code sent directly in the chat. Install it on WiFi before departure, and it switches on automatically once your phone finds a network in Serbia. Coverage along the Djerdap gorge and in the Zlatibor hills can dip in patches, which is normal for the terrain.
Serbian dinars are the local currency, and while cards work in Belgrade and Novi Sad, smaller towns like those near Djerdap still lean more heavily on cash. Many Western passport holders can enter visa-free for up to ninety days, but it is worth double-checking specific requirements before booking. Trains between Belgrade and Novi Sad are fast and reliable, but reaching Nis, Zlatibor, or Djerdap comfortably usually means renting a car or booking a private transfer, since bus schedules to some of these spots are limited. Summer brings the EXIT Festival crowds to Novi Sad specifically, so book well ahead if travel dates overlap with mid-July.
Does a Serbia eSIM cover the whole country, including Djerdap and Zlatibor? Yes, a single Serbia eSIM plan covers the country nationally, though remote stretches of the Djerdap gorge and mountain areas around Zlatibor can have weaker signal, which is standard for the terrain.
Is Serbia’s roaming really different from an EU country? Yes. Serbia sits outside the EU, so a European home SIM loses the free-roaming benefit the moment you cross the border, and standard international roaming rates apply instead.
How much data do I need for a week to ten days in Serbia? Most travelers covering Belgrade, Novi Sad, and one or two further stops are comfortable on 5 to 15GB depending on how much navigation and photo sharing they do.
What if my Serbia trip extends into a wider Balkans road trip? A regional plan tier covering neighboring countries like Bosnia and Montenegro can be set up instead of a Serbia-only plan, and a quick WhatsApp message with your full route gets the right one suggested.
Belgrade, Novi Sad, Nis, Zlatibor, and Djerdap cover a genuine cross-section of Serbia, and the phone setup should be one less thing to plan around. Message GLEE10 on WhatsApp for 10% off a Serbia eSIM plan, check current pricing on the Gleesim offers page, or see full carrier coverage on the Gleesim Serbia eSIM page. If the trip extends into a wider loop through Bosnia and Montenegro, the Gleesim Balkans road trip guide covers how a regional plan works across borders.
