5. Aachen: Aachen Cathedral
Finalized in 935, Aachen Cathedral, also referred to as the “Imperial Cathedral”, is the oldest cathedral in all of northern Europe. Between 936 and 1531, the establishment served as the church for the coronation of 30 German kings in addition to 12 German queens.
It was originally inspired by churches which were found in the Eastern Holy Roman Empire, and was developed throughout the Middle Ages while being further adorned by subsequent authorities thereby making it a complex and sophisticated masterpiece of architecture. It has inspired many other German constructions and is perhaps even more impressive in that it was chosen to be the final resting place for the eminent medieval ruler, Charlemagne.