I got rid of this huge 10ft wide circular fire pit in my lawn and was skeptical that I could grow grass over it.
the former owners did really use it, while digging it out I found all sorts of junk in it from hundreds of old large metal stakes, to hundreds of melted nails. I'm guessing they had a lot of parties and ended up just throwing all sorts of junk in there and burning it down bond fire style (hell I even found what looked like parts of an old rocking chair and melted down glass bottles).
I was thinking maybe I should just pay a professional to re-sod it, but wanted to try seeding it myself.. and holy crap grass is actually starting to grow on this burnt out area. Now that I see it can work I'm going to just re-seed the whole lawn myself.