For most films, it's a long, strange road from concept to screen, and sometimes those roads lead to dead ends. In 'Underexposed!: The 50 Greatest Movies Never Made', 50 artists from around the globe each contribute imagined poster art for one such dead-end film-a movie that never made it into production or that changed drastically from initial concept to final film. Each poster is accompanied by a short essay that explains the history behind a never-made...