Black and gray iceberg geometric background https://www.rawpixel.com/image/2860873/free-illustration-image-swiss-style-wallpaper-abstract-backgroundView license
Man in snow mountain speech bubble badge, travel photo https://www.rawpixel.com/image/6595253/image-speech-bubble-public-domain-shapeView license
Grayscale rhombus geometric background vector https://www.rawpixel.com/image/2865525/free-illustration-vector-two-tone-abstract-backgroundView license
3rd ASOS special warfare Airmen conduct unsupported, sustained cold-weather training during Operation Agipen 2: Part IIU.S.… https://www.rawpixel.com/image/11071583/photo-image-face-person-skyFree Image from public domain license
Black sunset mountain aesthetic background https://www.rawpixel.com/image/2865671/free-illustration-image-abstract-background-aestheticView license
A moon art astronomy painting. https://www.rawpixel.com/image/13343772/moon-art-astronomy-paintingView license
A person spinning sparklers to create circles of light in the mountains. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3293105/free-photo-image-path-light-banister-bridgeFree Image from public domain license
Coke ovens and burning slag heaps make heavy impenetrable smoke over whole town, day and night. Longacre, West Virginia.… https://www.rawpixel.com/image/12242576/photo-image-plant-sky-smokeFree Image from public domain license
Moon geometric aesthetic background in black and white https://www.rawpixel.com/image/2861005/free-illustration-image-abstract-background-aestheticView license
Ford-Corkscrew FireThe Ford-Corkscrew Fire rages to the East near Clayton, Washington. Photo by K. S. Brooks https://www.rawpixel.com/image/11071879/photo-image-plant-fire-skyFree Image from public domain license
'3 Geronimo' CALFEXU.S. Army paratroopers assigned to the 3rd Battalion, 509th Parachute Infantry Regiment, 2nd Infantry… https://www.rawpixel.com/image/11071716/photo-image-fire-sky-lightFree Image from public domain license
Nature landscape background, with ripped paper border https://www.rawpixel.com/image/6680766/image-background-torn-paperView license
Nachtgezicht met een soldaat bij een legerkamp (1785) by Reinier Vinkeles I https://www.rawpixel.com/image/13784712/nachtgezicht-met-een-soldaat-bij-een-legerkamp-1785-reinier-vinkelesFree Image from public domain license
An overcast purple-hued sky over the Diamond Peak. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3290681/free-photo-image-astronomy-cc0-cliffFree Image from public domain license
Get up and Go. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3291815/free-photo-image-adventure-astronomy-azusa-canyon-roadFree Image from public domain license
Coke ovens and burning slag heaps make heavy impenetrable smoke over whole town, day and night. Longacre, West Virginia.… https://www.rawpixel.com/image/12242864/photo-image-smoke-mountain-public-domainFree Image from public domain license