The rost on the pillars of the stables from 1886. It's all locked up and you can't get in. Plus, there wasn't really any sun today, just the grey cloudy last drops of sunlight at 3.30 pm, but the whatever light there was, was shining through a door opening, lighting the pillars and the ceiling a bit.
Thank you, Derek! @derekvickers It was tricky to get an image out of it - it was almost dusk and cloudy, and the place is locked up so you can only stick your camera through a gate. But I was glad I got at least one usable image. I liked the rust on the pillars and how only this one still caught a bit of light.
Thanks, @vstap . This is a pretty weird place for Germany - in the middle of the field or park, left alone and not paid any attention to. I will be back there when there will be more light, otherwise everything is just dark inside. I guess you will see more from there one day :)