The Rocky Mountains, Lander's Peak by James Smillie and Albert Bierstadt https://www.rawpixel.com/image/9085058/the-rocky-mountains-landers-peak-james-smillie-and-albert-bierstadtFree Image from public domain licenseView of Mounted Soldier? Watering his Horse in Bull Run, Blackburn's Ford, Virginia https://www.rawpixel.com/image/9183146/photo-image-plant-art-vintageFree Image from public domain licenseBook "Sun Pictures of Rocky Mountain Scenery" containing thirty photographic views along the line of the Pacific Rail Road… https://www.rawpixel.com/image/7653566/photo-image-book-vintage-artFree Image from public domain licenseBook "Sun Pictures of Rocky Mountain Scenery" containing thirty photographic views along the line of the Pacific Rail Road… https://www.rawpixel.com/image/7653677/photo-image-book-vintage-artFree Image from public domain licenseBridge on Orange and Alexandria Rail Road, as Repaired by Army Engineers under Colonel Herman Haupt https://www.rawpixel.com/image/9329230/photo-image-vintage-fire-woodenFree Image from public domain licenseExcavating for "Y" at Devereaux Station, Orange & Alexandria Railroad https://www.rawpixel.com/image/9329225/photo-image-vintage-public-domain-peopleFree Image from public domain licenseBook "Sun Pictures of Rocky Mountain Scenery" containing thirty photographic views along the line of the Pacific Rail Road… https://www.rawpixel.com/image/7652669/photo-image-plant-book-vintageFree Image from public domain licenseEnd of the Bridge after Burnside's Attack, Fredericksburg, Virginia https://www.rawpixel.com/image/12851820/end-the-bridge-after-burnsides-attack-fredericksburg-virginiaFree Image from public domain license[Soldiers in Creek, Below Orange and Alexandria Rail Road Bridge Across Bull Run, Virginia] https://www.rawpixel.com/image/12851990/photo-image-plant-person-forestFree Image from public domain licenseBook "Sun Pictures of Rocky Mountain Scenery" containing thirty photographic views along the line of the Pacific Rail Road… https://www.rawpixel.com/image/7652983/photo-image-book-vintage-artFree Image from public domain licenseBook "Sun Pictures of Rocky Mountain Scenery" containing thirty photographic views along the line of the Pacific Rail Road… https://www.rawpixel.com/image/7652858/photo-image-book-vintage-artFree Image from public domain licenseBook "Sun Pictures of Rocky Mountain Scenery" containing thirty photographic views along the line of the Pacific Rail Road… https://www.rawpixel.com/image/7652987/photo-image-book-vintage-artFree Image from public domain license