Pictured Rocks, Interior of Dungeon. [Marquette, Michigan] by Brainard F Childs https://www.rawpixel.com/image/14289862/pictured-rocks-interior-dungeon-marquette-michigan-brainard-childsFree Image from public domain licenseThe Plague Expedition to Anzob in Russian Turkestan. Photograph album by A.M. Levin, 1899. https://www.rawpixel.com/image/14005190/photo-image-person-ocean-seaFree Image from public domain licenseCaves in the Middle or Tore Lake, known as "The O'Donoghue's Wine Cellars." [Killarney] https://www.rawpixel.com/image/14303961/photo-image-face-person-oceanFree Image from public domain licenseFingal's Cave, Island of Staffa. (From the interior. Iona in the distance.) by A Franks https://www.rawpixel.com/image/14303749/image-person-art-collageFree Image from public domain licenseHercules vecht met Cacus (1515 - 1565) by Giovanni Jacopo Caraglio and Rosso Fiorentino https://www.rawpixel.com/image/13767773/image-paper-horse-cartoonFree Image from public domain licenseCave of the Dark Waters. Reflection Arch. [Wisconsin Dells] by Henry Hamilton Bennett https://www.rawpixel.com/image/14287578/photo-image-person-waters-public-domainFree Image from public domain licenseIndian Fall, veiled with Icicles, West Point. by Edward and Henry T Anthony and Co https://www.rawpixel.com/image/14285275/photo-image-mountain-animal-public-domainFree Image from public domain licenseSea outdoors sitting nature. AI generated Image by rawpixel. https://www.rawpixel.com/image/12056713/photo-image-plant-person-skyView licenseLes gorges du Tierroz à Grésy près d'Aix les Bains. by Georges Brun https://www.rawpixel.com/image/14286662/les-gorges-tierroz-gresy-pres-daix-les-bains-georges-brunFree Image from public domain licenseCave City [actually Horse Cave] on Saturday afternoon, Kentucky. Sourced from the Library of Congress. https://www.rawpixel.com/image/12322421/image-person-horse-skyFree Image from public domain licenseHebron and the Plain of Mamre, with Mosque Covering the Cave of Machpelah by Francis Frith https://www.rawpixel.com/image/14316925/image-trees-mountain-public-domainFree Image from public domain license The oldest surviving Wigwam Village Motel, part of what was once a series of quirky motels… https://www.rawpixel.com/image/8070019/photo-image-public-domain-city-united-statesFree Image from public domain licenseDruipsteengrot (c. 1841 - c. 1865) by Petrus Johannes Schotel https://www.rawpixel.com/image/13788384/druipsteengrot-c-1841-1865-petrus-johannes-schotelFree Image from public domain licenseA prisoner is sitting on straw in a cave with his feet chained to the wall, there are a few provisions on a small shelf in… https://www.rawpixel.com/image/13973006/image-cartoon-face-personFree Image from public domain licenseIndian Inscription Rock, at Indian Cave, on Mulberry Creek, Kansas by Alexander Gardner https://www.rawpixel.com/image/14286286/image-art-public-domain-paintingFree Image from public domain licenseThe source of the Ganges: Ice Cave at the foot of the Glacier by Samuel Bourne https://www.rawpixel.com/image/14320453/the-source-the-ganges-ice-cave-the-foot-the-glacier-samuel-bourneFree Image from public domain licenseCave of the Dark Waters, Place of Nah-hu-nah (Sturgeon). [Wisconsin Dells] by Henry Hamilton Bennett https://www.rawpixel.com/image/14288408/photo-image-person-art-watersFree Image from public domain licenseWoman at a rocky shore at Spar Cave on Isle of Skye in Scotland https://www.rawpixel.com/image/935989/hiker-surrounded-dark-cliffsView licenseWoman at a rocky shore at Spar Cave on Isle of Skye in Scotland https://www.rawpixel.com/image/935978/hiker-surrounded-dark-cliffsView licenseMontana De Oro State Park, Los Osos, California (1985) photography in high resolution by John Margolies. Original from the… https://www.rawpixel.com/image/3800571/photo-image-ocean-summer-beachFree Image from public domain licenseTimbered tunnel leading into mine. San Juan County, Colorado. Barren mountain sides attest to the amounts of timber which… https://www.rawpixel.com/image/12148869/image-person-art-patternFree Image from public domain licenseWoman at a rocky shore at Spar Cave on Isle of Skye in Scotland https://www.rawpixel.com/image/935942/traveler-spar-caveView licensePhoto of sunshine on the wooden surface https://www.rawpixel.com/image/91936/free-photo-image-forest-backgroundView licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for a sound roof. Sourced… https://www.rawpixel.com/image/12290221/photo-image-person-public-domain-natureFree Image from public domain license[Untitled photo, possibly related to: Kingman (vicinity), Arizona. A miner going toward a train of mine cars at the entrance… https://www.rawpixel.com/image/12297322/photo-image-plant-person-public-domainFree Image from public domain licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Unusually high roof in mine due to a… https://www.rawpixel.com/image/12289967/photo-image-public-domain-black-architectureFree Image from public domain licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for gas. Sourced from the… https://www.rawpixel.com/image/12289952/photo-image-person-public-domain-womanFree Image from public domain licenseMr. Merritt Bundy, member of Tri-County Farmers Co-op Market in Du Bois, Pennsylvania in the mine on his farm near Penfield… https://www.rawpixel.com/image/12276554/photo-image-person-horse-animalFree Image from public domain license[Untitled photo, possibly related to: Shenandoah National Park, Virginia, Skyline Drive]. Sourced from the Library of… https://www.rawpixel.com/image/12254044/photo-image-person-public-domain-womanFree Image from public domain license[Untitled photo, possibly related to: Home supervisor examining canned goods of rehabilitation borrower in food storage… https://www.rawpixel.com/image/12284560/photo-image-person-public-domain-foodFree Image from public domain licenseGrunge gray cement textured background https://www.rawpixel.com/image/593554/gray-concrete-wallView licenseInterior of storage cave. Falls City Farmsteads, Nebraska. Sourced from the Library of Congress. https://www.rawpixel.com/image/12266701/photo-image-person-public-domain-factoryFree Image from public domain licenseHand loading into a pit car. Old Ben number eight. West Frankfort, Illinois. See 26980-D. Sourced from the Library of… https://www.rawpixel.com/image/12272609/photo-image-hand-person-public-domainFree Image from public domain licenseWoman at a rocky shore at Spar Cave on Isle of Skye in Scotland https://www.rawpixel.com/image/936015/traveler-spar-caveView licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Mined out area which is being… https://www.rawpixel.com/image/12290256/photo-image-background-frame-patternFree Image from public domain licenseSacramento Pit copper mine at Bisbee, Arizona. This is a pit 435 feet deep. In 1911 a shaft was sunk into the slopes of the… https://www.rawpixel.com/image/12150259/image-art-sky-vintageFree Image from public domain licenseWoman at a rocky shore at Spar Cave on Isle of Skye in Scotland https://www.rawpixel.com/image/935950/hiker-surrounded-dark-cliffsView licensePonce, Puerto Rico. A cave in slum area in which two people live. Sourced from the Library of Congress. https://www.rawpixel.com/image/12279670/photo-image-person-public-domain-kidFree Image from public domain licenseWorkers in limestone quarry near Frederick, Maryland. Sourced from the Library of Congress. https://www.rawpixel.com/image/12269569/photo-image-person-public-domain-natureFree Image from public domain license[Untitled photo, possibly related to: Turkey Run, Parke County, Indiana]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12252834/photo-image-forest-public-domain-natureFree Image from public domain licenseTrampas, Taos County, New Mexico. A deserted adobe in a Spanish-American village in the foothills of the Sangre de Cristo… https://www.rawpixel.com/image/12290414/photo-image-mountains-public-domain-wallFree Image from public domain licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Pulling down poor roof. Sourced from… https://www.rawpixel.com/image/12290026/photo-image-person-public-domain-manFree Image from public domain licenseShoveling coal into a conveyer loader, Old Ben number eight. West Frankfort, Illinois (see 26980-D). Sourced from the… https://www.rawpixel.com/image/12272676/photo-image-person-public-domain-manFree Image from public domain license[Untitled photo, possibly related to: Ponce, Puerto Rico. A cave in slum area in which two people live]. Sourced from the… https://www.rawpixel.com/image/12279909/photo-image-person-public-domain-natureFree Image from public domain license161128-M-KJ317-094AT SEA, Indian Ocean (Nov. 28, 2016) A Marine with the Maritime Raid Force climbs a caving ladder attached… https://www.rawpixel.com/image/8727987/photo-image-public-domain-ocean-birdFree Image from public domain licenseSyracuse (vicinity), Sicily. Family in catacombs where more than 2,000 refugees were housed during the war. Sourced from the… https://www.rawpixel.com/image/12296516/photo-image-person-public-domain-familyFree Image from public domain licenseCloseup of animal eggs lying on the floor https://www.rawpixel.com/image/84703/premium-photo-image-animal-closeup-dirtView licenseMarine rock texture background https://www.rawpixel.com/image/2309788/free-photo-image-white-limestone-rock-wall-carbornateView licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Testing for gas. Sourced from the… https://www.rawpixel.com/image/12290230/photo-image-person-public-domain-natureFree Image from public domain license[Untitled photo, possibly related to: Shenandoah National Park, Virginia, Skyline Drive]. Sourced from the Library of… https://www.rawpixel.com/image/12252974/photo-image-person-animal-public-domainFree Image from public domain licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Firing a blast of dynamite. Sourced… https://www.rawpixel.com/image/12290258/photo-image-face-plant-peopleFree Image from public domain licenseAbandoned coal mine. Garrett County, Maryland. Sourced from the Library of Congress. https://www.rawpixel.com/image/12274730/photo-image-public-domain-nature-iceFree Image from public domain licenseHome supervisor examining canned goods of rehabilitation borrower in food storage cave. Labette County, Kansas. Sourced from… https://www.rawpixel.com/image/12283186/photo-image-hand-person-public-domainFree Image from public domain licenseRock surface texture background https://www.rawpixel.com/image/2309660/free-photo-image-marine-rock-texture-limestone-backdropView licenseExterior of storage cave. Falls City Farmsteads, Nebraska. Sourced from the Library of Congress. https://www.rawpixel.com/image/12266475/photo-image-person-sky-public-domainFree Image from public domain licenseInside mine workings of Mr. Merritt Bundy at his farm near Penfield. He is a member of the Tri-County Farmers Co-op Market… https://www.rawpixel.com/image/12275187/photo-image-person-public-domain-manFree Image from public domain licenseMechanical cutting machine that increases coal production. Old Ben number eight mine. West Frankfort, Illinois (see 26980… https://www.rawpixel.com/image/12272941/photo-image-person-public-domain-natureFree Image from public domain license[Untitled photo, possibly related to: Shenandoah National Park, Virginia, Skyline Drive]. Sourced from the Library of… https://www.rawpixel.com/image/12252795/photo-image-mountain-public-domain-natureFree Image from public domain license[Untitled photo, possibly related to: The Million Dollar Stope from which a million dollars worth of silver was taken in… https://www.rawpixel.com/image/12149032/image-art-boom-vintageFree Image from public domain licensePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Gathering coal. Sourced from the… https://www.rawpixel.com/image/12289960/photo-image-person-public-domain-manFree Image from public domain licenseSyracuse (vicinity), Sicily. Cave called the "Ear of Dionysius". Sourced from the Library of Congress. https://www.rawpixel.com/image/12296260/photo-image-plant-ocean-public-domainFree Image from public domain licenseWoman at a rocky shore at Spar Cave on Isle of Skye in Scotland https://www.rawpixel.com/image/935980/hiker-surrounded-dark-cliffsView licenseCarthage, Tunisia. American Army chaplains inspecting the ruins of the Roman arena where Christian martyrs were thrown to… https://www.rawpixel.com/image/12295242/photo-image-person-public-domain-manFree Image from public domain license