Crouching Figure of Atlas (1481–1536), vintage illustration by Baldassare Tommaso Peruzzi. Original public domain… https://www.rawpixel.com/image/9405265/image-frame-art-vintage-illustrationFree Image from public domain license
Silent Witnesses. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3288171/free-photo-image-alabama-hills-archaeology-blue-skyFree Image from public domain license
President Barack Obama greets patrons at the Sink Restaurant & Bar in Boulder, Colo., April 24, 2012. https://www.rawpixel.com/image/4050764/image-public-domain-person-restaurantFree Image from public domain license
Joshua Tree, United States. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3299715/free-photo-image-joshua-tree-astronomy-boulderFree Image from public domain license
Rocky mountain cliffs of Half Dome at Yosemite National Park illuminated by sunset. Original public domain image from… https://www.rawpixel.com/image/3288914/free-photo-image-best-stone-pictures-images-boulder-canyonFree Image from public domain license
Stone formation on green grass. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3295335/free-photo-image-moss-animal-archaeologyFree Image from public domain license
Italian landscape with boulders (1845), vintage nature illustration by Johan Thomas Lundbye. Original public domain image… https://www.rawpixel.com/image/12229910/image-art-watercolor-vintageFree Image from public domain license
Multiple waterfall streams flowing through mossy boulders. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286780/free-photo-image-waterfall-water-nature-oceanFree Image from public domain license
Close-Up Photograph of Boulder Dam. Photographer: Adams, Ansel, 1902-1984. Original public domain image from Flickr https://www.rawpixel.com/image/8799503/photo-image-vintage-public-domain-waterFree Image from public domain license
Power generation, electrical technicians. Original public domain image from Flickr https://www.rawpixel.com/image/8732283/photo-image-public-domain-people-constructionFree Image from public domain license
Photograph Looking Up at Wires of the Boulder Dam Power Units. Photographer: Adams, Ansel, 1902-1984. Original public domain… https://www.rawpixel.com/image/8799941/photo-image-vintage-public-domain-personFree Image from public domain license
Photograph of Electrical Wires of the Boulder Dam Power Units. Photographer: Adams, Ansel, 1902-1984. Original public domain… https://www.rawpixel.com/image/8799938/photo-image-vintage-public-domain-constructionFree Image from public domain license
A high-angle shot of a waterfall pouring down a rocky ledge into a clear pond in the woods. Original public domain image… https://www.rawpixel.com/image/3304912/free-photo-image-cave-big-tree-nightFree Image from public domain license
Fragrant Garden under a Hazy Moon by Nakabayashi Chikutō (Japanese, 1776–1853) https://www.rawpixel.com/image/9086738/image-chinese-painting-mapFree Image from public domain license
Dusk over the beach with boulders on the shoreline of Uttakleiv Beach. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286053/free-photo-image-beach-sky-sea-sunriseFree Image from public domain license
First Solar, a NREL research partner, has installed a small PV array used as part of Energy Systems Integration research… https://www.rawpixel.com/image/3322307/free-photo-image-solar-energy-renewable-panelsFree Image from public domain license
Spring in a Narrow Gorge (Quell in einer Felsschluct) by Arnold Böcklin https://www.rawpixel.com/image/14264446/spring-narrow-gorge-quell-einer-felsschluct-arnold-bocklinFree Image from public domain license
A Prehistoric Stone Circle on a Mound, an Extensive Landscape Beyond by Johann Heinrich Wilhelm Tischbein https://www.rawpixel.com/image/9085820/image-prehistoric-water-color-ground-line-artFree Image from public domain license
The newfound planet K2-288Bb (2019) illustrated by NASA's Goddard Space Flight Center/Francis Reddy. Original public domain… https://www.rawpixel.com/image/10184751/image-wallpaper-desktop-moonFree Image from public domain license
A slow shutter shot of a curved road in Boulder, with fast-driving car light trails. Original public domain image from… https://www.rawpixel.com/image/3286323/free-photo-image-universe-car-boulderFree Image from public domain license
The drummer, No. 1 (Sono ichi) from the series "The Boulder Door of Spring (Haru no iwato)" by Totoya Hokkei https://www.rawpixel.com/image/8956269/image-cartoon-person-patternFree Image from public domain license
Mounted fan painting: village buildings at C between rocky banks with clusters of full, mature trees; boulders and towering… https://www.rawpixel.com/image/7637768/image-background-art-vintageFree Image from public domain license
Sarutahiko, No. 2 (Sono ni) from the series "The Boulder Door of Spring (Haru no iwato)" by Totoya Hokkei https://www.rawpixel.com/image/8955313/image-cartoon-person-patternFree Image from public domain license
Rock climbing, extreme sports photography. Free public domain CC0 photo. https://www.rawpixel.com/image/6033252/photo-image-public-domain-person-wallFree Image from public domain license
Ama no Uzume, No. 3 (Sono san) from the series "The Boulder Door of Spring (Haru no iwato)" by Totoya Hokkei https://www.rawpixel.com/image/8951306/image-cartoon-person-patternFree Image from public domain license
Sarutahiko, No. 2 (Sono ni) from the series "The Boulder Door of Spring (Haru no iwato)" by Totoya Hokkei https://www.rawpixel.com/image/9042978/image-cartoon-person-patternFree Image from public domain license
A Shepherd and Muses by a Waterfall by Christoph Henrich Kniep https://www.rawpixel.com/image/14264407/shepherd-and-muses-waterfall-christoph-henrich-kniepFree Image from public domain license
At NREL’s Flatirons Campus substation is part of the Power Generation Upgrade Project changing the source of utility… https://www.rawpixel.com/image/3322323/free-photo-image-boulder-building-cableFree Image from public domain license
The A.B. Young Trail leaves from the southernmost end of the Bootlegger Picnic Area in Oak Creek Canyon north of Sedona… https://www.rawpixel.com/image/9648528/photo-image-plant-fire-leavesFree Image from public domain license
Boy Scouts make their way up a climbing wall at the 2017 Boy Scouts Jamboree at the Summit Bechtel Reserve, West Virginia.… https://www.rawpixel.com/image/3388211/free-photo-image-climbing-rock-activityFree Image from public domain license
Neotoma Drummondii (1845- 1848) illustrated by John James Audubon (1785-1851). Original from the Smithsonian National Museum… https://www.rawpixel.com/image/9065990/image-john-james-audubon-woodhouse-viviparous-quadrupedsFree Image from public domain license
Utah Department of Wildlife Resources process eggs harvested from Colorado River Cutthrout Trout on Dixie National Forest https://www.rawpixel.com/image/4076750/photo-image-public-domain-person-foodFree Image from public domain license
Green Turtle lying on rocks, showing carapace by Tom Iredale. https://www.rawpixel.com/image/13029031/green-turtle-lying-rocks-showing-carapace-tom-iredaleFree Image from public domain license
Trapped Boulder, White Mountains, from "Photographic Views from Mt.Washington and Vicinity and the Franconia Range" https://www.rawpixel.com/image/8848505/photo-image-art-vintage-public-domainFree Image from public domain license
3ft waterworn boulder (of local conglomerate) .... (27 April 1957) by Leslie Adkin. https://www.rawpixel.com/image/13028491/photo-image-plant-people-grassFree Image from public domain license
The newfound planet K2-288Bb, illustrated here, is slightly smaller than Neptune. Located about 226 light-years away, it… https://www.rawpixel.com/image/9975387/image-moon-art-spaceFree Image from public domain license
Criss Cross Rock, Joshua Tree National Park, southern California https://www.rawpixel.com/image/8726067/photo-image-background-aesthetic-public-domainFree Image from public domain license
a scholar in a waterside pavilion nestled among tall trees and boulders gazes out at a lone fisherman in a boat. Original… https://www.rawpixel.com/image/7656854/image-vintage-art-treesFree Image from public domain license
2022_09_08 BoulderMtnFire_HeloHelicopter flight over the Boulder Mountain Fire on the Colville National Forest in 2022. The… https://www.rawpixel.com/image/9647916/photo-image-fire-airplane-treesFree Image from public domain license