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.
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.
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.