Zagreb rewards a focused itinerary built around its walkable Upper Town. Start at Ban Jelačić Square, the city's central meeting point, then climb into Gradec for St. Mark's Church and its colorful tiled roof, pausing at the quirky Museum of Broken Relationships along the way. Zagreb Cathedral anchors neighboring Kaptol, while Tkalčićeva Street offers the best spot for coffee between sights. A joining a walking tour ties these landmarks together with local history that plaques alone cannot convey. This shortlist keeps sightseeing efficient without skipping what makes Zagreb worth the stop.