Our semi-detached was the last in the street built and they buried all sorts of waste in the gardens to get rid of it - next door had a 'feature' lump in the front garden, quite a lot of bricks contained within. (early 70's build)

I'm just glad I didn't find bones, like the next house owners will. We've buried two bearded dragons in the garden.

We had a spring mattress n a bike frame under the raised bit at the back....ppl r ace aren't they 👀🤣