In 1915, Laura Ingalls Wilder traveled by train from her home in Missouri to San Francisco. Laura's westward journey to visit her daughter, Rose Wilder Lane, coincided with a spectacular event taking place in that city-the Panama Pacific International Exposition. This was a great world's fair celebrating the completion of the Panama Canal, and Laura was amazed by the attractions that had been gathered there. Her husband, Almanzo, was unable to leave their Missouri farm, and it was Laura's letters that gave him the chance to see what she saw during her visit to California. These letters, gathered together here, allow the reader to experience Laura's adventures and her intimate thoughts as she shared with her husband the events of her exciting sojourn.