Metropolis (1927)
Fritz Lang vision of the future produced what is arguably the most valuable movie poster ever sold. The original German Metropolis poster achieved over 1.2 million dollars at auction in 2012.
Star Wars (1977)
The original Style A and Style B one-sheets for Star Wars are highly collectible, particularly in unfolded Near Mint condition. The advance poster is the rarest and most valuable of the initial release materials.