After some study I found out this photo was taken before the Gelbe Kaserne in Aachen. The Gelbe Kaserne is not there anymore but was located at the corner of the Düppelstraße / Elsasstraße. These german soldiers surrender at the Düppelstraße.
It would not surprise me if the trees still the same as in the old photo.
Then image: Photo by © Hulton-Deutsch Collection/CORBIS/Corbis via Getty Images
Now image: www.NOWstalgia.EU / Cor Sleutel

German Prisoners march through the Sedanstrasse junction Adalbersteinweg in Aachen under American armed guard after their surrender on 21 October 1944.
Then image: US Army (non commercial use)
Now image: www.NOWstalgia.EU / Cor Sleutel

Shermans moving through the Adalbertsteinweg of Aachen 1944. Nice detail for me is the buiding that is still the same as back then.
Then image: ?
Now image: www.NOWstalgia.EU / Cor Sleutel

While civilians leave the city of Aachen, An M10 tank enters Aachen, 1944 during the battle of the city.
Then image: ?
Now image: www.NOWstalgia.EU / Cor Sleutel

American machine gunners fire down the Adalbertsteinweg in Aachen during the attack of the city in 1944.
Then image: US signal Corps
Now image: www.NOWstalgia.EU / Cor Sleutel

US soldiers of the 26th Infantry Regiment attend to a wounded soldier during street fighting in Aachen, Germany. October 1944.
Then image: ?
Now image: www.NOWstalgia.EU / Cor Sleutel & Grace Kailuhu

German soldiers, the last to capitulate when the city of Aachen surrendered to U.S. forces, marching at the Theaterplatz. Note the skeleton propped against wall at left.
Then image: ?
Now image: www.NOWstalgia.EU / Cor Sleutel

Just near my hotel I discovered this photo of an antitank gun in the Gasborn Strasse, , during the assault of Aachen, in October 1944. Any more info is welcome.
Then image: Aachen Stadarchiv.
Now image: www.NOWstalgia.EU / Cor Sleutel

Text will follow soon