Yet, in many instances, the only remaining record of these buildings is on Margolies' film, because tourist architecture was endangered by the expansion of the interstate system and changing travel desires. Emerging with the prosperity of the post-WWII era, roadside and commercial structures spread with the boom of suburbanization and the expansion of paved roads across the United States. Margolies' Roadside America work chronicled a period of American history defined by the automobile and the ease of travel it allowed. These holdings form the core of what Margolies considered the exemplary images of his subject matter.

Approximately half of the slides show sites in California, Florida, Michigan, New Jersey, New York, South Carolina, and Texas, but all 48 contiguous states are represented.The Library of Congress began to acquire portions of the archive in 2007, with the bulk of the materials arriving in 2015. Frequent subjects include restaurants, gas stations, movie theaters, motels, signage, miniature golf courses, and beach and mountain vacation resorts.

Photographed over a span of forty years (1969-2008) by architectural critic and curator John Margolies (1940-2016), the collection consists of 11,710 color slides (35mm film transparencies). The John Margolies Roadside America Photograph Archive is one of the most comprehensive documentary studies of vernacular commercial structures along main streets, byways, and highways throughout the United States in the twentieth century.

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