This is a rare postcard from the 1904 World's Fair in St. Louis, featuring a hold-to-light effect that illuminates the buildings and exhibits. It is a Scott's # 323 Livingston postcard, made in the United States and is a great addition to any collection of historical memorabilia or World's Fair souvenirs. The postcard showcases the technological advancements of the time and offers a glimpse into the past with its intricate design and attention to detail.