There is actually more than one great mystery of life at work here. Firstly, why would anyone take a picture of a parking lot for a postcard, especially in such a uniquely beautiful spot as the Smoky Mountains? Secondly, who would buy a card like this? Well, I guess I bought it, so I can't say too much about that.
Here's the back of the card. Unfortunately, there is no message relating a pleasant (or otherwise) experience at the parking lot.