Prairie Dog Town in western Kansas. The Elvis Is Alive Museum in Wright City, Missouri. The Velvet Museum ("Velveteria") in Portland, Oregon. A 13-foot Styrofoam scale model of Stonehenge. The Largest Ball of Twine in Cawker City, Kansas . . . or is it in Darwin, Minnesota? Roadside attractions are the staples of the American road trip. Many are slowly disappearing from our highways and byways. Are they culture or kitsch? Are their creators artists...