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 Collegiate Church Saint-Jacques for the best route, though you can start/finish anywhere. Interactive Exploration: Navigate a 4.2km walk (~54 mins walking time). Solve riddles using imagination and observation at stops like the Palace of the Prince Bishops or the Opéra Royal de Wallonie to unlock your next spot. Total activity lasts ~3 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 or audio guide at sites like Saint Bartholomew’s Church. Includes hand-picked local restaurant and shop tips. Available in 6 languages: EN, DE, FR, NL, IT, ES. Note: Outdoor-only; internet required.