Photography credits:
William Barstow Strong: Kansas State Historical Society; William Jackson Palmer: Carl Mathews Collection, Pikes Peak Library District, 005-375; Queen Palmer: Photograph by William Bell, Margaretta M. Boas Photograph Collection, Pikes Peak Library District, 001-6025; The Royal Gorge, Grand Canyon of the Arkansas: William Henry Jackson, The Royal Gorge, Grand Cañon of the Arkansas, c1880, The J. Paul Getty Museum,
Los Angeles, Digital image courtesy of the Getty's Open Content Program;