At my last house there definitely seemed to be 'something' inexplicable. Sometimes my cat would sit on the back of our sofa and just stare at the top of the door for ages and ages and could not be distracted even if we flapped our hands in front of her face. Sometimes she would make her teeth chatter at whatever it was that she saw, but not every time. After she died, it was two years before I had another cat. She did exactly the same thing in exactly the same place . . . It was actually quite freaky to watch.
The other thing, in the same house, I would frequently be aware of someone else in the kitchen and would turn to speak to them thinking it was my OH or whoever else was in at the time, only to find there was no-one there. My Sister iL, without my ever having mentioned anything about this, told me that she often turned to speak to me in the kitchen, but I wasn't there. Whatever/whoever it was seemed benign, I never felt afraid. The house wasn't old and, as far as I know, had no history of anything spooky.
I'm very open-minded and just feel that there's so much we still don't know about our world.