GGW's Dwyer Park Butterfly Garden is documented within the
Smithsonian Institution’s Archives of American Gardens. 
 

The Smithsonian Institution's Archives of American Gardens was established to provide scholars, researchers, and interested persons with visual documentation of historic and vernacular gardens.  The Garden Club of America's Collection within the Archives of American Gardens, founded in 1987, is a project of the GCA's Garden History and Design Committee to increase the Smithsonian's collection by continuing to document a wide variety of gardens throughout the United States that are not documented elsewhere. The goal is to continue to educate the public about garden history and design styles and to preserve our garden heritage.  Although private gardens make up most of this GCA collection, the Smithsonian will accept some public gardens that are not documented elsewhere.  GCA clubs often submit small public garden projects that they have been involved with in their communities.
 

You can find more on the GCA website by going to the GH&D landing page under "committees."