John Samuel Margolies was an architectural critic, photographer, and author who was noted for celebrating vernacular and novelty architecture in the United States, particularly those designed as roadside attractions. Starting from the mid-1970s, he began to photograph sites during long road trips, since he was concerned these sites would be displaced by the growing modernist trend. He was credited with shaping postmodern architecture and recognizing buildings that would be added to the National Register of Historic Places through his documentary work. Starting in 2007, the Library of Congress began to acquire his photographs, and created the public domain John Margolies Roadside America Photograph Archive in 2016, consisting of 11,710 scans of color slides taken by Margolies.

A roadside attraction is a feature along the side of a road meant to attract tourists. In general, these are places one might stop on the way to somewhere, rather than being a destination. They are frequently advertised with billboards. The modern tourist-oriented highway attraction originated as a U.S. and Canadian phenomenon in the 1940s to 1960s, and subsequently caught on in Australia.