Discover Stralsund, the Hanseatic port that once built the tallest building on Earth, through a self-guided walking tour you control entirely from your own smartphone. Follow eight handpicked stops - from the modern Ozeaneum's Baltic aquariums to the soaring red-brick towers of St. Mary's Church, once the tallest structure in the world - while an audio guide narrates the stories behind each landmark. Along the way, quizzes turn sightseeing into a game, testing what you've just learned about Stralsund's merchant history, its cannon sheds turned harbour halls, and the guarded gates that once protected its craftsmen's quarter. There's no app to download and no physical guide to keep up with: everything runs right from your phone, so you can pause for a coffee, backtrack for a photo, or linger at your favourite square without losing your place. Move at your own pace and explore this UNESCO World Heritage old town the way it deserves to be explored, one storey at a time.