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 small structure from 1840 is the oldest undamaged synagogue left in Germany. It now houses an exhibition on Erfurt's Jewish community.
In this twin-towered Gothic church, Luther preached the Reformation, was married (1525) and baptized his six children. Inside, Cranach's huge Reformation Altar includes scenes of Christ and Luther.
Built in 1859-66 and meticulously restored, the New Synagogue of Berlin is an exotic amalgam of styles with a Moorish feel. It is both an active synagogue and a museum.