Granus Tower, Aachen

"With four Carolingian projectiles reaching up to a height of 20 m, the Granusturm is the most significant still upright Carolingian profane structure in existence. Its original function can only be speculated to this day. The unique complex structure of the rooms and staircases inside the tower still raises many questions that can not be satisfactorily answered according to current knowledge. In the past, it housed prison rooms and later part of the city archives. "
Source: aachen.de/DE/kultur_freizeit/kultur/geschichte/chronoskope/station_granusturm.htmlFurther detailed information at: rathaus-aachen.de/rundgang/granusturm

The Granus Tower is not open to the public. Here you still have the opportunity to get an impression of the oldest preserved part of the former imperial palace.The Granus Tower was built together with Charlemagne's King's Hall at the turn of the 8th and 9th centuries. Its lower four floors, reaching a height of about 20 meters, date from this period, the fifth and sixth floors from the 14th century. Its spire was repeatedly destroyed by fire or war. The current one was built in 1979.The outer appearance of the tower is relatively simple. However, the Carolingian floors in particular have a complex internal spatial structure: a stairwell winds around mostly vaulted square interiors, which connected the main entrance to the tower on the lowest floor with two other doors on the second and fourth floors. These doors led to the upper floor or to the roof of a porch that stretched along the entire south side of the auditorium, which is no longer preserved.
Source:
rathaus-aachen.de/rundgang/granusturm

A lot to see! Beautiful city!