We had this horrible old bathroom... Like, this thing was a nightmare. Even adult me would fear it, but little kid me was absolutely PETRIFIED.
The house we lived in was an old 3 story colonial where the previous owner, an old lady in deteriorating health, had spent the last 20 or so years living ONLY on the first floor. The second and third stories were in very poor condition. My parents renovated the third floor and made it into their master suite, and they turned the first floor into an office for my mother's veterinary practice, which left the nightmare 3rd floor for the rest of the family.
They cleared out the mold, added new insulation to the exterior walls and put up fresh drywall in most of the other rooms, but that creepy as fuck bathroom was almost unchanged, outside of a fresh coat of paint.
It was shaped like a backwards L, with the door at the end of the short branch and the toilet behind a small wall just past the intersection. There was a sink across from the toilet and a bathtub at the end of the L... and only an exposed light bulb, located approximately at the center of the large branch, to light it. No other outlets to power anything, either.
Now this bathroom looked like it had been last redone in the 1920s. You know that weird tile that looks like little white squares with the corners cut off and littler black squares where they should be? It had that. And a stand alone sink with this horribly water damaged mirror above it. The sink taps were rusty and hard to turn, the light threw horrible shadows because us kids had to jump to grab the chain to turn it on which made the bulb swing like crazy. The bathtub was ancient and made of iron so it was always freezing cold and baths sucked... but the worst part... there was a section of tile on the wall behind the tub which was gone.
Looking back, I think that missing section had probably once held a soap dish. Back then, I thought it was the portal from where all monsters emerged. It created an echo chamber for all the creaky old pipes, it was an inky, impenetrable darkness that was never lit by that stupid swinging bulb, and the edge of it was juuuust so slightly out of line of sight when one was on the toilet.
Yeah, that place was fucking horrifying. And my mother locked me in there and threw the breaker so I couldn't turn on the light.