These beautiful and mysterious Pan Am posters were designed in 1971 by Chermayeff & Geismar. What’s remarkable about these posters — other than the minimal design and the use of Helvetica — is the power of the photography. The simple, sometimes monocromatic, images make a clear statement about the location and inspire the viewer. You can see a few other examples here and here.
DCrit student Frederico Duarte did a little digging and discovered some interesting info about the posters. You can read the story on the Eye Magazine blog and in a feature.