I am in the process of checking and updating the links on my website, a laborious process made easier with the Firefox link checker, and came across the excellent German Wikipedia page for Roman Cologne:
Colonia Claudia Ara Agrippinensium
Reconstruction of Colonia Claudia Ara Agrippinensium
(Romano-Germanic Museum, Cologne)
I may find similar pages as I progress with the link checking on other travelogue pages and will post them here.