It is very difficult to photograph the Dom in Koln (Cologne) as it is smack in the middle of a busy town, not dissimilar from St. Patrick's Cathedral in NYC. I walked around it during the daytime and couldn't get a good shot. Then I noticed the bridge across the Rhein and was a walking path alongside the train tracks. I walked across the river to the other side and shot a few images photographing the Dom and used the arches of the bridge as a leading line. I felt it would look better at night and so I came back after dinner to shoot from the same spot.
There is an issue with Uploading Photos (attachjments). I am not sure what the problem is, and I am looking into it. You can still try to Create your Threads and Upload your Photos, but it is hanging up during the Upload.