Ulm Minster holds a record that it spent over five centuries earning. Construction began in 1377, but the spire, at 161 metres ( making it the tallest church tower in the world), wasn't completed until 1890. The medieval masons' lodge, the Bauhütte, started coordinating the work that same year. It is still active today, training stonemasons in the same traditions it has observed for nearly 650 years.

The Minster has a habit of attracting the extraordinary. In 1811, a local tailor named Albrecht Ludwig Berblinger wanted to launch his homemade glider from the spire. Permission was refused, he was pushed off from the Danube bank instead, crashed into the water, and died impoverished and mocked. He is now recognised as one of the genuine pioneers of flight.

VoiceMap's self-guided tour uses the Minster as its starting point, tracing the city's medieval Jewish community, the Einstein family connection, and the masons whose craft has never really stopped.