Marguerite “Peggy” Guggenheim is best known for her legacy of collecting modern art in both Europe and the United States, but scholars have overlooked her importance as a patron of modern architecture, specifically the exhibition spaces that showcased her art collection. This thesis fills the gap of literature by tracing the architectural history of the collection. Guggenheim represented a catalyst for bridging the role of art and architecture by promoting modern art through three different spatial approaches: creating collaborative and didactic gallery workspaces at Galerie Guggenheim Jeune in London (1938-1939), establishing architectural spaces that employed unique display techniques at Art of This Century in New York (1942-1948), and instituting a final home-museum at Palazzo Venier dei Leoni in Venice (1949-present). Through the use of primary sources, such as Guggenheim’s autobiography, archival sources including familial correspondences, original black and white photographs, newspaper articles, and architectural drawings, I resituate Guggenheim as not only an art patron and collector, but also a benefactor of modern architectural spaces. / text