Košice packs Slovakia's grandest old town into a single boulevard. The country's largest cathedral, a musical fountain, an ornate nineteenth-century theatre and a medieval defensive edge all line one elegant pedestrian spine, much of it built by recycling the city's own gravestones and cathedral stones. This self-guided walking tour traces that pragmatic, layered history along Hlavná. Everything runs from your phone. You get a clear map of all 10 stops, simple directions through Google Maps, and a short audio story with an interactive quiz at each location. The route runs from St. Michael's Chapel and St. Elisabeth's Cathedral up Hlavná past the Singing Fountain, the State Theatre and the Plague Column, out to Crafts Lane, the Executioner's Bastion and Jakab Palace. 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.