Alfred Stieglitz opened the New York gallery known as 291 in 1905 and used it to show modern art.
The gallery was originally called the Little Galleries of the Photo-Secession. It took its better-known name from its address at 291 Fifth Avenue in Manhattan. Stieglitz used the space to present photography alongside European and American modernist art.
Although Georgia O'Keeffe became closely associated with Stieglitz's later gallery activities, her first solo exhibition with him took place at 291 in 1917. The gallery introduced New York audiences to artists such as Pablo Picasso, Henri Matisse, Paul Cézanne, and Constantin Brâncuși.
The gallery closed in 1917 after the building was sold. Stieglitz later operated galleries including the Intimate Gallery and An American Place. The number 291 is therefore the specific answer for the Fifth Avenue venue, not the broader 1913 Armory Show.