Some of the posters go back as late as the 1890s. Many are valued at over a $1,000 – the most expensive is a travel promotion for Atlantic City valued between $10,000 and $15,000.

A 1939 Pan Am poster (left) features a Boeing Super Clipper 314 landing in a tropical lagoon; a 1932 poster advertises the industrial bombast of Italy’s new “super-express” ocean liners, the ...

Pan Am is synonymous with glamorous travel. Although the airline stopped flying in 1991, the name still emanates nostalgia and symbolizes an era before the words “overtourism” or “selfie ...