Novi Sad & the Danube: From Petrovaradin to Fruška Gora

Petrovaradin Fortress rises above the right bank of the Danube and earned the nickname 'Gibraltar on the Danube' for once being nearly impregnable; the cornerstone of today's southern section was laid on 18 October 1692 by Charles Eugène de Croÿ. The fortress is known for more than 16 kilometres of preserved underground tunnels and for its reversed clock tower, nicknamed the 'Drunken Clock': the small hand shows minutes, the large hand shows the hour, said to have been built so Danube fishermen could read the time from a distance. Since 2001 it has hosted the EXIT festival, which began in 2000 as a student movement; whether and when it continues after the 2025 disputes over state funding isn't something this guide can confirm without a reliable source — here, that simply means: unknown.

Novi Sad is the fifth-largest city on the Danube and the largest that is not a national capital; the river divides the Bačka and Srem regions around it. During the 1999 NATO bombing, all three of the city's Danube bridges — the Žeželj, Varadin and Liberty bridges — were destroyed, along with water and power supply; the bridges were later rebuilt. Today the riverbanks host walking paths and boat tours, though which boat departs at what time and at what price shifts by season and operator; that kind of current detail isn't listed here without a verified source, and where it's uncertain, this guide says so honestly. Watching the silhouette of Petrovaradin Fortress from the riverbank is one of the calmest moments the city offers.

Fruška Gora is a mountain range in the Srem region and Serbia's oldest national park; it was declared in 1960 and its 266.72 square kilometres are almost entirely forested. Ottoman-era records mention 35 monasteries, of which 16 are still active today; this density earned the mountain the nickname 'Serbian Mount Athos', and the Serbian Orthodox Church officially declared it a Holy Mountain in 2003. Krušedol Monastery, founded in 1509, is considered the most significant because it holds the tombs of Serbian rulers; Novo Hopovo and Grgeteg are also among the oldest.

Sremski Karlovci was first recorded as a fortress in 1308 and later grew into a baroque town on the Danube. The 72-day congress of 1698-99 ended in the Treaty of Karlowitz between the Ottomans and the Habsburgs, and it was the first time international diplomacy used a round negotiating table. The town became the religious and cultural centre of Serbs under Habsburg rule, and the Serbian Patriarch still holds the title 'Metropolitan of Karlovci' today. The Four Lions Fountain on the main square was built in 1799 by Italian architect Giuseppe Aprili in red marble; legend says whoever drinks from it will return to the town. Karlovci is considered the birthplace of the dessert wine Karlovački bermet; exactly which cellar is open at what hour isn't stated here without a verified source.

Novi Sad lies roughly 80 kilometres from Belgrade and is easy to reach by road; Petrovaradin Fortress is within walking distance of the city centre, while Sremski Karlovci and the monasteries of Fruška Gora suit a day trip. A reasonable route starts at the fortress, follows the riverbank to Karlovci, and ends among the monasteries of Fruška Gora.