In Köln (Cologne) there are still remains of a strong Roman fort to see. Actually the name of the district Köln-Deutz is deriving from the name of this fort called Divitia. During Roman times this fort guarded the big Rhine bridge connecting the Germanic side of the river with the Roman town Colonia Claudia Ara Agrippinensium.
Near the Roman Museum in Cologne one can see this reconstruction of an ancient street. In Cologne it is generally known as ‘Hafenstrasse’ though it isn’t really leading to a port. It isn’t an exact reconstruction of the former street either but the basalt stones are from Roman times at least.
The Roman Tower (Römerturm) is one of several towers in Cologne dating back to Roman times. At the time of the Romans, the city was called Colonia Claudia Ara Agrippinensium. A strong wall with a total of 19 towers surrounded the ancient city. Remains of this wall are still visible today. [German]