Yesterday, I set out from home with no plan other than to make the most of the sun and get a bit of fresh air. I just wandered. And I ended up walking along the Karl-Marx-Allee.
Unfortunately, because of my lack of planning my feet were tired and I was ready to call it a day by the time I reached Frankfurter Tor so my photos are mainly from one side of the street. I will have to go back another day and walk from Frankfurter Tor to Alexanderplatz on the South side of the street.
There is an excellent article about Karl-Marx-Allee on Journey to Berlin with more detail about the history of the street and plenty more photos.