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1904 St. Louis World's Fair/ Louisiana Purchase Exposition Digital Resources



The 1904 St. Louis World's Fair, officially known as the Louisiana Purchase Exposition, was held to celebrate the centennial of the Louisiana Purchase and to showcase global advancements in industry, culture, and technology. Spanning 1,200 acres in St. Louis's Forest Park, the fair featured over 1,500 temporary buildings that housed exhibits from more than 60 countries and numerous U.S. states. Most of these structures were built using "staff," a temporary material made from a mixture of plaster, cement, and fiber, which allowed for elaborate designs at a low cost but was not intended for long-term use. The fair attracted nearly 20 million visitors from April 30 to December 1, 1904, leaving a lasting cultural impact. After the fair ended, most of the buildings were dismantled or demolished, and Forest Park was restored to its original state, with a few exceptions.



One of the few surviving structures is the Palace of Fine Arts, which was designed to be a permanent structure from the beginning and is now the Saint Louis Art Museum. Unlike the other buildings, it was constructed with more durable materials, including limestone and a steel framework, ensuring its longevity. Architect Cass Gilbert designed the building in the classical Beaux-Arts style with the intention of it serving as a long-term cultural institution after the fair concluded. Once the exposition ended, the building was repurposed, and over the years, it underwent various renovations to enhance its role as an art museum. Today, it stands as one of the most significant remaining legacies of the fair, continuing to serve as a prominent cultural landmark in St. Louis.



What is "Staff"?

“Staff” was a temporary building material widely used in the 1904 St. Louis World’s Fair (Louisiana Purchase Exposition), made from plaster of Paris—a substance with ancient roots—combined with natural fibers like hemp, jute, or straw, and sometimes glue or other binders. While plaster of Paris had long been used for fine sculpture, statuary, and ornamental interior elements (even in earlier fairs like the 1851 Great Exhibition), it was inherently brittle and unsuitable for large-scale outdoor use.

The innovation of “staff” in the 1893 Chicago World’s Fair came from modifying plaster of Paris into a reinforced composite that could be molded into decorative architectural panels and applied over wooden or metal frameworks. The added fibers made it more flexible, durable, and weather-resistant, though still temporary. This transformation allowed for the creation of massive classical-style buildings that looked like stone but were far cheaper and quicker to build. For the 1904 fair, over 1.5 million square feet of staff were fabricated on-site by skilled artisans. After the fair, most staff-clad structures were torn down, and the material—never intended for permanence—crumbled or was buried in Forest Park, where fragments occasionally resurface today.



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