In this building there are 4 shower rooms on the 2nd floor. They are completely unmarked and locked. For quite awhile the HR staff would sheepishly show up at my door with a new employee asking me to tell them where the showers were because they couldn't remember. That was before you needed a key.

Now that there's a key, there's a formal process so HR is all over it.

I used to work in a building that had shower facilities in every suite over a certain size and another that had them in the basement along with a hot tub and some weight lifting equipment. I've also worked in an old airport terminal from the 30's that had showers which were originally intended for travelers. I guess there were rooms for rent there at one time too. Anyway, in all of these places I always found out about them by word of mouth or just exploring.