In July 2009 I spent a week-end in Magdeburg, basically two nights after arriving there from Berlin at noon..., well-worth my time seeing and exploring the place. Originally, I had planned to do a day trip r/t from Berlin but decided in the end to spend two nights so as to have a more leisurely time in the city and explore more. It is another place where you can walk across the Elbe
The Zentrum is interesting, historical monuments too but I didn't see one pertaining to WW1, or missed it. See the church where Luther preached, the explanation indicates that after Luther's first time preaching in Magdeburg, the city went over to his side. In 2009 the cathedral was being refurbished, ie not functioning as a church.
In 1945 Magdeburg was obviously a target since it is on the Elbe and in the path of the US Ninth Army armored spearheads. pushing to Berlin. They put two bridgeheads across the Elbe at/near Magdeburg, one was destroyed .