Aachen is best known as the seat of the unified Western European empire under Charlemagne of the…read moreCarolingian Empire. His Palace of Aachen comprised of structures for political, residential, and religious purposes. The Aachen Town Hall was constructed 1330-1349 atop the foundations of the Aula Regia or King's Hall of the Palace. Above ground, only the Granus Tower of the King's Hall is retained.
"From 936 to 1531, the German kings held their coronation banquets in the original Carolingian King's Hall, and later in the Coronation Hall of the Town Hall. The Town Hall is the official seat of the Lord Mayor and the Aachen city council." - Aachen Rathaus signage
Unfortunately, we were in Aachen on a Monday when Museums are closed, but the Charlemagne Centre contains a model of an artist's rendition of the palace complex. Wikipedia has a possible reconstruction, too: https://en.wikipedia.org/wiki/Palace_of_Aachen