Why is Aachen important?

Aachen is historically significant as the preferred residence of Charlemagne, who made it the center of the Carolingian Empire in the late 8th and early 9th centuries. The city is home to the Aachen Cathedral, a UNESCO World Heritage site, which houses Charlemagne's throne and is a notable example of Carolingian architecture. Additionally, Aachen has been a site for the coronation of numerous Holy Roman Emperors. Today, it remains an important center for science and technology, hosting a prestigious university and various research institutions.