Around where one of my friends lives, there is an old abandoned quarry. It became a swimming hole, then was later abandoned again after too many people drove their cars into it to commit suicide. They never were able to get all the cars out, plus there is likely a few suicides whose bodies were never recovered because the water is too murky.
The whole area is fenced in, and you can see a structure or two left standing from when it was a place to swim.
Also there are lots of abandoned buildings in the nearby town of Coatesville, most of these are boarded up. I wish I could explore these, but Coatesville has a lot of crime, not sadly it's not safe to do so.
For those who live outside of the US, there is a place in Michigan that is very nearly a ghost city!
Just about an entire city (Detroit, I think it is) that almost nobody lives in anymore. Skyscrapers, office buildings, shops, houses etc, exempt of people. It was a town who's major income was building automobiles, so when these plants went overseas to decrease cost, the city pretty much died.
There are a few pockets of people who still live there, but that's it. When the house prices all over the country dropped 1-2 years ago from the National Recession, you could buy a Detroit house for as little as a dollar after it made their prices hit rock bottom.
In some of the skyscrapers, you can see moss growing in the carpeting (even in some of the top floors!), they have been unused for so long.
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Crispy Pickles!!