Marc Chagall was already in his 90s when the first of his windows went into St. Stephan’s Church in Mainz. He kept making them until he died in 1985. Father Klaus Mayer asked him in the 1970s, and as a French Jew, Chagall’s yes came to symbolise Franco-German friendship, Jewish-Christian unity and peace.

The windows bathe the church in blue. The building itself dates from 990 and is the burial place of Archbishop Willigis. He ended up here because a fire, the cathedral’s first, meant he could not be buried there. Outside, hobbyist beekeepers keep hives against the church walls.

VoiceMap’s Roman Legacy tour climbs the steep hill to the church, points out the beehives, and stops outside to explain Willigis’s burial and the windows before you go in.