Butler University Libraries has several collections that can be accessed online. These include collections held by the department of Special Collections, Rare Books, and University Archives.
The W. H. Bass Photo Company was present in Indianapolis from the late 19th century through the circa 1970s. The company documented the state and progression of many buildings throughout Indianapolis. The Indiana Historical Society has only a small fraction of the many images available so if a building is not present in the digital collection, be sure to reference the collection guide for how to search all of the materials in the Bass Photo Company Collection: https://indianahistory.org/wp-content/uploads/bass-photo-collection.pdf.
The Indianapolis Public Library digital collections not only includes their own collections but also digitized materials from people within the Indianapolis and Marion County community. You can view digitized materials via search, collection, and even collecting initiative. For more information about Special Collections at the Indianapolis Public Library, visit their website: https://www.indypl.org/locations/central-library/indianapolis-special-collections-room.