It was all unremarkable until I bought a cat. I hated the place but boy did that cat love the old apartment.
The first remarkable thing that happen was the cat could walk into rooms and vanish. She was Siamese so she was pretty vocal, even when not visible. Once she vanished, I could hear her but never find her until she chose to reappear. It was baffling. After a while, I got used to it.
One day while washing dishes, I opened a cupboard. The cupboard was annoying, it was a massive wooden structure 2-3 feet deep, yet opening the doors revealed that there was only about 12 inches of space to put things. I had assumed that the pipework was taking up the rest of the space. In any event, the cat entered the bottom cupboard. I bent over to grab her and guess what?
She wasn't there. I opened all of the cupboards and drawers as if there was a chance I was mistaken about her entering the only open door. I could hear her meowing, happily, but no cat in sight.
Then I heard it. Swish, clank. Meow! Swish, swish, clank! Meow.
I almost bolted from the apartment.
Instead, I grabbed a chair, a cup of coffee and sat down. I could hear the cat moving, sometimes from within the cupboard. But other times, the sound was coming from the bathroom or the bedroom, which was on the other side of the wall. Her movements were punctuated with that odd swish-clank! noise.
Three cups of coffee later, the cat reappeared from the cupboard I saw her enter. I noticed a small hole in the back of the cupboard, just big enough for a determined cat to enter. On closer inspection, I noticed many small holes, often no more than an inch or two in diameter in the back of each cupboard. Very odd.
The next day, I armed myself with a flashlight, paper, pencil and a ruler. A map like the one below was the result. This map is not to scale, it is more a schematic and from memory.
The first thing I noticed when mapping the old apartment was that if a door could open, it would often block another doorway. Annoying. Item 2, room dimensions didn't make sense relative to the exterior size of the house. And the cupboard was disturbingly disproportional to the room and interior storage space.
There was obviously a space behind it. Looking in the various holes revealed something disquieting. There were ropes, chains and pieces of cloth.
If I was the bolting kind, I would have been gone at this point.
With a little experimentation, I was able to determine the function of this odd cupboard. It was physically dominating in the room, obviously hiding a space behind it. Aside from the small holes, no bigger than a couple of inches, there were no larger openings. Nothing on the walls behind it nor the attic above or the apartment below. Violently opening or closing the cupboard doors caused air to enter the holes and made the fabric, ropes and chains swing noisily. It was meant to distract.
But distract from what?
In my bedroom, the cat had taken a liking to the closet. It turns out there was a secret passage way from the closet of one bedroom to the closet of the other bedroom. It was about 7 feet long. In bedroom two, there was an odd grill, which looked like a heater vent. Except, there was no central heat in this apartment. I had a gas heater awkwardly placed in the kitchen, nearly blocking bedroom 2's doorway. It turns out this grate could be pushed upwards to allow access to the bathroom.
In the bathroom, across from this grate was an inset shelf, no more than 3 inches deep. Pushing it allowed access to the large space labeled with a question mark. This area was about 10 by 10 and painted jet black. Or so it seemed. I entered the area without a light and as my eyes adapted, I noticed the shapes standing along the wall. And they were looking at me.
This time I did bolt.
When I worked up the courage to reenter the apartment, the cat was happily playing in this space so I had to go back in there. With a baseball bat and a very bright flashlight.
Someone had painted the walls with odd blue, pink, purple and mauve lines. They were not even and sometimes broken lines. At about head level, there were white ovals. Only the floor and ceiling were actually black. These shapes looked like people standing against the wall. How creepy.
In this space, I noticed two ladders. One went up and one went down. One lead to the basement and another lead upwards to a crawl space. It was horribly filthy and the wooden catwalk was only about 18 inches wide. I decided not to try my luck.
Later that evening, while sitting in the living room, I took a good look at the old fireplace. It had been sealed up years ago and was now a rather small but nice bookshelf. That matched the shelf in the bathroom. I pushed it and it slid back to reveal another space.
This area was a crawlspace with a ladder to one side, again with the odd paint job, which also covered a window. When a window's glass is painted over, the creep factor climbs by 101. I climbed up the ladder and noticed the same 18" crawlway leading back to the bathroom. This was no an attic of any kind, it was a catwalk above the ceilings. I could see that the area above the cupboard was sealed up with thick wood planks. Some odd bumps might have been the chains and ropes.
I have no idea what all of this was for. Maybe someday I will tell what my landlady said about the apartment and my friend's theories. But not at night. I don't want to think about it.