Monday night I got a permission to visit the terrain of the "Emscherklärwerk in Dinslaken" to make some photos of the "Faultürme" at the purification system.
The odors were not very pleasant... ;)
Thank you Kerstin (Nalani7) for the good hint, they are really impressive.
Thank you Mr. Stegemann for the exception approval !!!
tried different filters + tonemapped