This is one of those things that you won't readily find in a book but I think is awesome. Nearly every single parking garage in Germany reserves the top floor of the parking area for women. Pregnant women, single women, groups of women...it doesn't matter as long as it's only women in the car. This is done as a safety precaution so a lady who went shopping for the day or met up with a friend for dinner isn't left to walk four floors underground to find her car. Germany is generally a very safe place but bad things still happen here. I take advantage of this every time I'm out by myself.
Oh and there is usually a monitor to make sure you're following the rules. If you try to park there with a male in the car you are almost sure to get yelled at!