I found these amazing pictures on this site. Amazing how little has changed actually. These are not true color photographs but created by the photochrom process.
Here is a much higher resolution version of the above picture I found.
Digging deeper I found the original source of these pictures and a few more which has very high resolution TIFFs. I put the high resolution photos together in an album here.
I also found out that in 1908 a tram line was built through the city that actually passed under the Dom tower.