From Bonn, I took a day trip to Düsseldorf. As with many towns in the area, there is evidence of Roman civilization but it was not organized into a town until the 12th century. After rule during the Napoleanic era, it became part of Prussia in 1815 and during that time it was an industrial hub of the area. During WWII, it was heavily damaged and much of the old town was destroyed.
Stadterhebungs monument commemorating city rights to the town.
Kaiserpfalz Kaiserswerth is the ruins of a Monastery that dates back to 700. This area is a little bit outside of Düsseldorf and many of the buildings are still intact.
