This feature class includes buildings standing at the time of the 1904 Louisiana Purchase Exposition (World's Fair) held in St. Louis Missouri. Since the feature class was created to serve a hypothetical web map for the Missouri History Museum, it also includes attributes indicating the index category of each building, whether the building is still extant, its current name if it is, and a space for popup links to enable Museum staff to add hyperlinks to catalog records for pertinent documents, photographs and objects. A few popup links have been pre-populated, merely as a proof of concept.