Where in the heck is Wall Drug?

One of the South Dakota tourist attractions is Wall Drug. As to why, I can’t figure out. It is just a drug store out in the middle of no where, but apparently it is on the way to see the badlands so everyone stops there. I’ve only heard of what it is like as I’ve never been there personally, but from what I hear they sell a lot of touristy things. You know the stuff, things you would never buy for any other reason but this stuff has Wall Drug printed on it. I don’t know why that stuff sells, but it sure does.