Rheinhallen

The Köln-Triangle is a high rise building in Deutz, immediately by the waterfront. It is a part of a building complex fronted by the Rhine-facing Hyatt hotel and is hard to miss due to its prominence and quite easily accessible from both Deutz and the left bank of the Rhine (simply cross the Hochenzollern bridge from the Altstadt). On its 29th floor, it has a viewing terrace called Panorama, which is publicly accessible via a lift for a relatively reasonable fee. The terrace has glass all around it for both safety purposes and for exhibiting the names of various landmarks you can see from it. If you want to take really good photos, you may want to have a piece of cloth with you to clean the glass of fingerprints and such. The viewing terrace is closed during bad weather (like storm or hail).

Operas are performed in the Staatenhaus while the opera building at Offenbachplatz is being renovated. Season starts in Mid-September.

The historic building of the station now known as Köln Messe/Deutz is an interesting piece of architectural heritage many visitors to Cologne miss as they exit the station on the fairgrounds side.

Also called the Locking Bridge. If you walk to the back of the Kölner Dom along a straight path, there is a bridge on the Rhine to your right that is covered in padlocks. The locks are placed there by couples to show their loyalty to each other. Couples often have their names and a significant date inscribed on the locks. There are other places around the world that have "love padlocks".