The road sign in TX-Dennis's #3 is not a fabrication. There is a real town of Bat Cave in western NC on US Route 64. I know, I've been there. I was in the area for a cousin's wedding and for some reason I was looking at a map and saw this town on the map and figured that this was too good to pass up.
So I drove down to Bat Cave and parked my car with Batmobile plates at the town limit sign and post office to take pictures of my car. To top it off, a local gentlemen saw me taking pictures of the car and said he would take a picture so I could be in the picture with my car with the Batmobile license plates at the town limit sign for Bat Cave, NC.