Pedestrian underpasses are often dull or without concept "embellished" by undemanding graffiti. Mostly not a nice picture, not a pretty sight for pedestrians. European cities may be more beautiful!
We will get to the bottom of things.
Together with the municipalities, a variety of underpasses could be transformed from grey concrete to colorful art.
Image: The green area shows the area that may be beautiful by local artists (Image Processing: Julian Vogel)