next to a house I use to live in there was two inch diameter galvanized pipe sticking out of the ground,I figured it was a vent to an old fuel barrel and had been parking next to it for a couple of years.
one day I decided to pull the pipe out and had a devil of a time getting it out of the ground,some cemented brick came with it.
after digging down a foot or so I discovered a redbrick lined cavity four feet by four feet by eight feet.
the three story house had been there since 1899,the cavity or once figured out was in fact a cistern was used to store water for the steam boiler that heated the place.
I also found out the house was the office of the original hardware store there and later was a funeral parlor for several years.
I was more spooked by the fact that I had been parking directly on top of that cistern!!