Crystal glacier ice cave in Iceland https://www.rawpixel.com/image/428410/interior-ice-caveView licenseLooking up from Moorgate London Underground Station, United kingdom https://www.rawpixel.com/image/427029/architecture-blue-skyView licenseCrystal glacier ice cave in Iceland https://www.rawpixel.com/image/428411/free-photo-image-cave-ice-tunnelView licensePioneer Square in Seattle, Washintong. Original image from Carol M. Highsmith’s America, Library of Congress… https://www.rawpixel.com/image/3092284/free-photo-image-city-carol-highsmith-americaFree Image from public domain licensePeople waiting for a train on a platform https://www.rawpixel.com/image/1219096/subwayView licensePeople waiting for a train on a platform https://www.rawpixel.com/image/1219099/subwayView licenseUnderground subway station https://www.rawpixel.com/image/435084/free-photo-image-train-dark-place-cityView licenseOne of the wine-cellar "caves" at the Schramsberg Vineyard winery in California's Napa Valley. Original image from Carol M.… https://www.rawpixel.com/image/422026/free-photo-image-wine-cellar-wineryFree Image from public domain licenseBlurred American flag on a moving train https://www.rawpixel.com/image/1219186/subwayView licenseThe underground tube in London https://www.rawpixel.com/image/426906/free-photo-image-london-underground-tubeView licenseCreepy underpass covered in graffiti on a dark rainy day in Hackney Marshes. Original public domain image from Wikimedia… https://www.rawpixel.com/image/3296631/free-photo-image-grafitti-skate-park-pavementFree Image from public domain licenseLooking down a symmetrical staircase in an urban transportation station. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3290747/free-photo-image-architecture-banister-buildingFree Image from public domain licenseTube train passing station with motion blur as passengers wait in the United Kingdom. Original public domain image from… https://www.rawpixel.com/image/3285622/free-photo-image-subway-tube-whiteFree Image from public domain licenseAn empty staircase and two escalators in a tunnel in London. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3296700/free-photo-image-tunnel-architecture-banisterFree Image from public domain licenseMan putting on his headphones https://www.rawpixel.com/image/532299/music-through-headphonesView licenseColorful graffiti in the back alley https://www.rawpixel.com/image/527104/free-photo-image-graffiti-hip-hop-wallView licenseRail tracks within 1,500 feet of underground passages at the Beckley Exhibition Coal Mine. Original image from Carol M.… https://www.rawpixel.com/image/434371/free-photo-image-mine-miner-west-virginiaFree Image from public domain licenseTrain station walkway https://www.rawpixel.com/image/67436/free-photo-image-stairs-arrow-sign-daylight-abstractView licenseMan texting at a subway station https://www.rawpixel.com/image/532281/man-hoodie-texting-train-stationView licenseBillboard screens by underground escalator https://www.rawpixel.com/image/3838905/billboard-screens-underground-escalatorView licenseDark underground pathway. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3288820/free-photo-image-dark-corridor-bunker-buildingFree Image from public domain licenseAn underground empty urban industrial dark parking lot with fluorescent light over it in landmark place. Original public… https://www.rawpixel.com/image/3300380/free-photo-image-stock-dark-path-parking-lotFree Image from public domain licenseDark empty corridor. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3303808/free-photo-image-blue-and-white-background-hall-architectureFree Image from public domain licensePortrait of a man at a subway platform https://www.rawpixel.com/image/583459/black-man-the-cityView licenseGreen arrow on a staircase https://www.rawpixel.com/image/560438/teal-arrow-gray-staircasesView licenseTunnel at Yosemite National Park in California, USA https://www.rawpixel.com/image/429927/free-photo-image-tunnel-night-street-lightView licenseBillboard screen by underground escalator https://www.rawpixel.com/image/3820971/billboard-screen-underground-escalatorView licenseThe Kings Cross tunnel empty https://www.rawpixel.com/image/2047702/the-kings-cross-tunnel-londonView licenseLight at the end of tunnel. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305017/free-photo-image-pipe-brown-sights-beigeFree Image from public domain licenseView from the bottom of subway escalators https://www.rawpixel.com/image/539208/free-photo-image-elevator-tunnel-stairsView licenseSubway train in rapid motion https://www.rawpixel.com/image/539197/free-photo-image-train-subway-metroView licenseGray wall mockup inside of a train station https://www.rawpixel.com/image/534828/free-photo-image-subway-wall-mockupView licenseWaiting man texting on his phone https://www.rawpixel.com/image/532346/music-through-headphonesView licenseWoman traveling alone on a train https://www.rawpixel.com/image/532277/premium-photo-image-podcast-headphones-woman-africanView licenseWoman traveling alone on a train https://www.rawpixel.com/image/532241/solo-woman-listening-music-and-textingView licenseCozy light underground city background architecture building sunlight. AI generated Image by rawpixel. https://www.rawpixel.com/image/12636730/photo-image-background-plant-spaceView licenseFrench exit sign and light in urban underground car park, Parking du Centre Commercial La Part-Dieu. Original public domain… https://www.rawpixel.com/image/3296456/free-photo-image-alloy-wheel-arrow-images-automobileFree Image from public domain licenseWoman looking at her watch while waiting for the train during the coronavirus pandemic https://www.rawpixel.com/image/2328035/free-photo-image-travel-covid-wearing-watchView licenseSick woman in a mask coughing in public during coronavirus pandemic https://www.rawpixel.com/image/2300980/free-photo-image-covid-cough-physical-illnessView licenseMan walking inside of underground tube in London https://www.rawpixel.com/image/2047642/underground-tube-station-londonView licenseCouple having an argument on the subway platform https://www.rawpixel.com/image/532364/free-photo-image-black-guy-man-and-girl-angry-couple-argumentView licenseMan walking up the stairs https://www.rawpixel.com/image/532355/premium-photo-image-stairs-going-walkingView licenseCouple checking a public transportation map https://www.rawpixel.com/image/519945/premium-photo-image-public-transport-london-tube-subwayView licenseSubway station in London, UK https://www.rawpixel.com/image/6175655/subway-station-londonView licenseLight shining through a modern structure. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3294059/free-photo-image-abstract-architecture-buildingFree Image from public domain licenseGreenbrier historic resort hotel in White Sulphur Springs, West Virginia. Original image from Carol M. Highsmith’s… https://www.rawpixel.com/image/3092739/free-photo-image-hotel-america-carol-highsmithFree Image from public domain licenseWoman wearing a mask while waiting for the train during the coronavirus pandemic https://www.rawpixel.com/image/2329909/free-photo-image-mask-covid-phoneView licenseSick woman in a mask coughing in public during coronavirus pandemic https://www.rawpixel.com/image/2300994/free-photo-image-pandemic-photography-covid-allergyView licenseMoorgate London Underground Station, United Kingdom https://www.rawpixel.com/image/427124/free-photo-image-architectural-architecture-blueView licenseLondon underground train https://www.rawpixel.com/image/3820904/london-underground-trainView licenseUnderground subway platform with seats. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297538/free-photo-image-bus-stop-1116-architecturFree Image from public domain licenseLight shining through trash cave. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297581/free-photo-image-underground-car-rockFree Image from public domain licenseBlack and white interior of building with concrete architecture and a person in the background. Original public domain image… https://www.rawpixel.com/image/3299282/free-photo-image-hallway-architectural-detail-architectureFree Image from public domain licensePerson gets off an escalator inside a gray industrial building. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3300448/free-photo-image-escalator-banister-blackandwhiteFree Image from public domain licenseWoman wearing a mask while waiting for the train during the coronavirus pandemic https://www.rawpixel.com/image/2330052/free-photo-image-travel-covid-face-maskView licenseThe Kings Cross tunnel empty https://www.rawpixel.com/image/2053929/the-kings-cross-tunnel-londonView licenseStanding passenger listening to music on the train https://www.rawpixel.com/image/532503/premium-photo-image-podcast-sad-african-man-listen-musicView licenseWaiting man texting on his phone https://www.rawpixel.com/image/532312/premium-photo-image-african-american-aloneView licenseDiverse business people commuting underground https://www.rawpixel.com/image/1458/free-photo-image-city-walking-wall-peopleView licenseUntitled [Charing Cross Underground Station] (February 1938) by Eric Lee Johnson. https://www.rawpixel.com/image/13027715/photo-image-public-domain-london-adult-apparelFree Image from public domain licenseWarehouse concrete tunnel light. https://www.rawpixel.com/image/12202326/photo-image-light-wall-blackView licenseBlue billboard sign, business advertisement with blank space https://www.rawpixel.com/image/5983700/photo-image-frame-businessView license