Colorado - John Muir - The Mountains are Calling - Sunset and Lake - Photograph (12x18 Art Print, Wall Decor Travel Poster) Colorado - John Muir - The Mountains are Calling - Sunset and Lake - Photograph (12x18 Art Print, Wall Decor Travel Poster) Standard 12x18 print, ready for framing Printed in the USA on heavy stock paper using a high-end digital printing press Perfect for your home, office, or a gift Browse thousands of images available, click Lantern Press, above