Cardiff wears its whole story in stone: a Roman fort, a Victorian Gothic fantasy castle built on coal money, the grandest civic centre in Britain, a covered market on the site of the old gaol, and a 74,000-seat rugby stadium wedged right into the Victorian streets. This self-guided walking tour traces that restless evolution through the heart of the Welsh capital. Everything runs from your phone. You get a clear map of all 9 stops, simple directions through Google Maps, and a short audio story with an interactive quiz at each location. The route runs from the National Museum and City Hall in Cathays Park down past Cardiff Castle and its Animal Wall, through the famous Victorian arcades and medieval St John's to the covered market and the Principality Stadium. 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.