The tour starts at Basel's grandest surviving medieval city gate, built in red sandstone with two round towers. Listen to the audio story on your phone and answer the on-site quiz before walking into the old town.

One of Switzerland's most ornate Gothic fountains, standing where Basel's fish market once traded. Your audio guide explains its carved figures, followed by an on-site quiz.

Walk out onto Basel's historic Middle Bridge over the Rhine to see the Kappelijoch, the small chapel-shrine standing midway across. Audio story and on-site quiz.

Basel's oldest parish church, set on the terrace above the Rhine. Your audio guide covers its long history, followed by an on-site quiz.

The bright-red Renaissance Rathaus on the Marktplatz, with its painted facade, arcaded courtyard and clock tower. Audio story and on-site quiz.

The Augustiner Brunnen street fountain on the lane climbing toward the Munster, past the old university quarter. Audio story and on-site quiz.

The red sandstone cathedral standing above the Rhine, rebuilt after the 1356 earthquake and now a Basel landmark. Audio story and on-site quiz on the Munsterplatz terrace.

The lively square at the heart of the old town, named after the former Barefoot Friars' church that still stands on it. Audio story and on-site quiz.

The tour ends at Jean Tinguely's kinetic fountain on Theaterplatz, where welded scrap-metal machines spray and clatter in a shallow basin. Final audio story and quiz.