Places not to miss on a weekend break in Novi Sad

Explore the subterranean tunnels of Petrovaradin Fortress. More people died in the 88-year building of this 17th century complex than did in battle and its formidable design meant it was only attacked on one occasion. It’s free to explore the ramparts, but touring the 16km of corridors weaving below the city requires a guide (only 1km is accessible to the public). Tours in English require a minimum of 10 tickets (although at £2 each, it’s possible to pay the lot yourself ). Visit the City Museum, part of the fortress, for information on timings.