Local Insight: The Danube River in Serbia is lined with a chain of seven medieval fortresses, a defensive network built between the 14th and 18th centuries. Belgrade Fortress is the largest, but the journey along the river reveals stunning strongholds like Golubac and Smederevo, each with tales of kings, despots, and epic battles.

Golubac Fortress, with its ten towers, was so strategically important it changed hands between Serbs, Hungarians, and Ottomans multiple times. Its position at the entrance to the Iron Gate gorge controlled all Danube traffic—who held the fortress, held the key to the Balkans.

Beneath Petrovaradin Fortress in Novi Sad lies a 341-meter-long secret tunnel, built in 1883. Known as “Through the Tunnel,” it was used to transport supplies under the railway and was abandoned after WWII. It’s a hidden layer of history beneath the mighty fortress walls.

These tours don’t just show you old stones—they connect you to the living pulse of Serbian history. You’ll stand where Roman legions marched, touch walls that withstood Ottoman sieges, and hear stories of kings and despots that shaped the Balkans, all with a local guide bringing the past vividly to life.