I’m pretty sure that this ghost sign says “Wm. Hall Sells Everything,” plus there’s some older lettering underneath. This building is located pretty much across the street from the Roosevelt Arch entrance to Yellowstone National Park.
It’ll take me a while to wade through my Yellowstone photos to put together a post, but here’s the arch in all its majestic Big Sky glory:
For now, this is my capsule review of the experience: