St. Martin's Cathedral, the thousand-year-old seat of the Archbishop of Mainz.

Dietrich Bonhoeffer, one of the modern martyrs celebrated in stone at Westminster Abbey.

Stained glass windows from the Augustinian Monastery in Erfurt, Germany.

Ecclesia and Synagoga, symbols of medieval anti-Judaism in many European churches and a reminder of the troubling relationship between Christianity and antisemitism.

Detail from the Berliner Dom.

The Marienkirche near the Fernsehturm at Alexanderplatz, Berlin--a reminder of church-state tensions in communist East Germany.

Statue of St. Boniface, 8th century missionary to Germany, in Mainz.

All Saints' Church (Castle Church), Wittenberg.