Novi Sad grew between two very different worlds: a commercial city on one bank of the Danube and a vast Habsburg fortress watching from the other. That borderland history is still written across its streets, in an Art Nouveau synagogue that survived the destruction of its community, a church everyone calls a cathedral even though it technically isn't one, an Orthodox bishop's palace rebuilt after bombardment, a riverside memorial to the victims of the 1942 Novi Sad Raid, and a fortress clock whose hands are deliberately reversed. This self-guided walking tour traces that essential route from the historic centre across the Danube to Petrovaradin Fortress. Everything runs from your phone. You get a clear map of all 8 stops, simple directions through Google Maps, and a short audio story with an interactive quiz at each location. The route begins at Novi Sad Synagogue and Menrat's Palace, continues through Liberty Square to the Church of the Name of Mary and the Orthodox Bishop's Palace, then passes through Danube Park to The Family memorial on the riverfront. From there, cross the Varadin Bridge into Petrovaradin, pass through the Baroque Belgrade Gate and climb to the famous Clock Tower for the final view back across Novi Sad. The final section through the fortress is uphill, so comfortable shoes are a good idea. Start anytime, pause whenever you like, and explore freely. No groups, no schedules. Audio and text available in 7 languages. And it comes with a free eSIM, redeemable once per account, so your map, directions and audio work from the moment you arrive, with no roaming charges.