Commissioned by Charlemagne in 786 AD, Aachen's cathedral is the oldest in Northern Europe and contains several holy relics.
Founded in 1010, the cathedral of Hildesheim contains many treasures of early medieval art, including bronze doors carved with biblical scenes and a bronze column showing the life of Christ.
The house where Luther and his family lived is well-preserved and full of Reformation relics, including Luther's desk, his pulpit, and first editions of his books.
Schottenkirche St Jakob
Founded by Irish missionaries, this Romanesque church is famed for its fascinating sculptured portal.
Built in the 1300s on the site of earlier cathedrals, this is the finest Gothic building in Bavaria. Its harmonious exterior is alive with medieval sculptures and inside is medieval stained glass.
This imposing castle, a symbol of German identity and a World Heritage Site, is where Luther lived in hiding as Knight George. Here he threw an inkpot at the devil and translated the Bible into German.
St. Anne's Church
Founded in 1321 by Carmelite monks, this fine Gothic church went on play a role in the history of the Reformation. It is notable for its fine works of art and its Luther museum.
Bonn's towering Romanesque basilica stands over an ancient shrine to the martyrs Cassius and Florentius.