Celle's old town holds Europe's largest closed ensemble of half-timbered houses, nearly five hundred of them, standing wall to wall exactly as the Guelph dukes and their merchants built them. This self-guided walking tour follows the tension between the two: a moated Renaissance castle with one of Europe's oldest court theatres, and streets of carved gables, painted planetary gods, and a market square that has traded on the same cobbles for seven centuries. 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 Celle Castle through the Bomann-Museum and the carved timber streets to the Stadtkirche tower, the market square, and the Altes Rathaus, ending at the town's oldest dated house. 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.