Bookstores themselves are a good example. Borders and Barnes & Noble put all the local bookstores out of business. Then Amazon put them out of business. Now most towns don't have a bookstore at all.
Big cities I'm sure still have some, they have enough population to support them even if most people don't patronize them.
I see a fair number of them, scattered around, not even in ultra-populated areas, but the last 3 or 4 times I've stopped in to try and buy things for e.g. holiday gifts, they've had none of the things I was looking for in stock, and they always seem empty.
I hope that's not a national trend, but I suspect it is.
On top of that, Barnes & Noble is closing their larger locations, and replacing them with tiny ones that simply aren't compelling if you're looking for something specific.