A previously unknown collection of over 25,000 black and white architectural photographs were discovered in a dilapidated house owned by the Indiana Limestone Company in Bedford, Indiana. These images of residences, churches, universities, museums, businesses, and public and municipal buildings, many of which were designed by prominent architects, document the use of Indiana limestone throughout the United States from the late 1800s to mid-1900s. Remarkably holistic in scope, these photographs and their accompanying metadata can be studied across major disciplines such as American history, architectural history, history of technology, urban studies, history of photography, historic preservation, labor history, and the history of geology. The Indiana Geological Survey in partnership with the Indiana University Libraries has been cataloging, digitizing, archiving, and publishing online a growing subset of the photographs through the Libraries' Image Collection Online portal. Thanks to a grant from the U.S. Institute of Museum and Library Services, administered by the Indiana State Library, we will be able to process an additional 4,500 photographs, and add approximately 3,000 images to the existing online collection, Building a Nation: Indiana Limestone Photograph Collection. Join us as we unravel the story behind the collection's discovery and our plans for ongoing curation and digitization.