A Seamless & Flexible Start: Download the World City Trail app and use your 10-digit booking reference to log in. Note: This is 100% self-guided; no one will be waiting for you. Start anytime 24/7. We suggest starting at the Alte Oper for the best route, though you can start/finish anywhere. Interactive Exploration: Navigate a 2.2km walk (~30 mins walking time). Solve riddles using imagination and observation at stops like the historic Römerberg or the iconic Iron Footbridge to unlock your next spot. Total activity lasts ~1.5 to 2 hours on average, depending on your pace and breaks. Your Tour, Your Way: Customize your route, change the order of places, or skip stops to fit your schedule. Pause for a break or to explore a site and resume exactly where you left off. There is no time limit—your access lasts for a full year. Stories & Tips: Unlock legends and history via text at sites like the Goethe House. Includes hand-picked local restaurant and shop tips. Available in 6 languages: EN, DE, FR, NL, IT, ES. Note: Outdoor-only; internet required.