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.
Located next door to the cathedral, this church has a distinctive triple-towered east end and a celebrated monumental tomb by the Master of St. Severus.
This is easily the greatest Gothic cathedral in Germany and it has been Cologne's most famous landmark for centuries. Once the tallest building in the world, it still has the largest facade anywhere.
On the door of this church in 1517, Martin Luther posted his 95 Theses against the sale of indulgences - and launched the Reformation. The church contains the tombs of Luther, Melanchthon and Frederick the Wise.