Don't know if they're still there, but CVG (Cincinnati) used to have* several huge depression-era murals depicting various kinds of work along the walkways between terminals. They were moved there from the railroad station, where they were originally placed, to keep up with where travelers can be found these days.
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*Back when CVG was a major Delta hub and my travel patterns had me change there a lot. That was toward the end of the 1990s.