The tour starts at this thirteenth-century gate tower on the Rhine, built on pile foundations to control the river crossing. Your audio guide explains why the point where Lake Constance narrows into the Seerhein became the city's strategic anchor, and a quiz follows.

Munster Unserer Lieben Frau, the cathedral on Munsterplatz where the Council of Constance held its sessions. Your audio guide covers the building's long construction history and its tall neo-Gothic spire, followed by a quiz.

Peter Lenk's satirical fountain, reached by way of St. Stephan, the old town's parish church on Sankt-Stephans-Platz. Your audio guide unpacks the sculptor's jabs at local politics and the church's role in the quarter, each with a quiz.

The last surviving gate of the medieval city wall, straddling Hussenstrasse at the edge of the old town. Your audio guide explains how the gate worked as a checkpoint and why this one outlived the rest, followed by a quiz.

The red sandstone fountain on Marktstaette, at the gateway between the harbour, the station and the medieval old town. Your audio guide points out the sculptural details that turned a solemn imperial monument into something much cheekier, followed by a quiz.

The lakeside Council Building, built as a fortified warehouse and used for the 1417 conclave that elected Pope Martin V and ended the Great Western Schism. Your audio guide sets out how the Council worked, followed by a quiz.

The tour ends at Peter Lenk's nine-metre rotating statue at the tip of the harbour pier, holding up two small figures that mock the emperor and the pope of the Council era. Your audio guide covers the row it caused when it appeared in 1993, and a final quiz.