Underground Railroad Scene from BlenderGuru

Hey all! I am having a problem texturing the walls of my underground railroad from the BlenderGuru tutorials. I am uploading the picture, and if you look at the walls, right under the lights you can see that the walls are stretching. I have the mapping sent to “Tubing” but I just can’t figure out how to stop the stretching in that one part, and it is driving me nuts! Does anyone know of anything that could help it look better? Or am I going to have to UV map?

I was also having some mapping problems, but I just UV unwrapped in the end. It’s just a case of trial and error!

I attached my final result!