Zagreb, Croatia’s northwestern capital, is distinguished by its 18th- and 19th-century Austro-Hungarian architecture. The city boasts a charming medieval ‘old town’ with beautiful cobbled streets. At its center, Upper Town is the site of the Gothic, twin-spired Zagreb Cathedral and 13th-century St. Mark’s Church, with a colorfully tiled roof. Nearby is pedestrian-friendly Tkalčićeva Street, lined with outdoor cafes. Lower Town has the main square, Ban Jelačić, plus shops, museums and parks. I spent only one night in Zagreb, but I could feel it’s young-at-heart vibe.