Saguaro Sentinel. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally enhanced… Free Image from public domain license 
The Postman (Joseph Roulin) (1888) by Vincent Van Gogh. Original from the Barnes Foundation. Digitally enhanced by rawpixel. Free Image from public domain license 
Saguaro Cactus near Tucson, Arizona. Original image from Carol M. Highsmith’s America, Library of Congress collection.… Free Image from public domain license 
Fall Scene in Vermont. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally… Free Image from public domain license 
Pacific Ocean and rocky California coast. Original image from Carol M. Highsmith’s America, Library of Congress… Free Image from public domain license 
Muir Woods. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally enhanced by… Free Image from public domain license 
Yosemite National Park. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally… Free Image from public domain license 
