Painting architecture flooring building. https://www.rawpixel.com/image/13725859/painting-architecture-flooring-buildingView licenseEmpty underground corridor with drainage system and metal pipelines ceiling tunnel city. https://www.rawpixel.com/image/14385951/photo-image-light-water-roadView licenseArchitecture building corridor technology. https://www.rawpixel.com/image/13692890/architecture-building-corridor-technologyView licenseDark tunnel lighting street city. https://www.rawpixel.com/image/12634228/dark-tunnel-lighting-street-city-generated-image-rawpixelView licenseEmpty wall stage architecture backgrounds building. https://www.rawpixel.com/image/14389133/empty-wall-stage-architecture-backgrounds-buildingView licenseMangahao Hydro-Electric Scheme, 1921 : 8th, 9th, 10th and 11th visits (1921) by Leslie Adkin. https://www.rawpixel.com/image/13029631/image-architecture-mining-people-old-picturesFree Image from public domain licenseA wooden aqueduct on the New River at Bush Hill near Enfield, North London. Lithograph. https://www.rawpixel.com/image/13953248/image-background-cartoon-personFree Image from public domain licenseTunnel infrastructure architecture illuminated. https://www.rawpixel.com/image/13251816/tunnel-infrastructure-architecture-illuminatedView licenseThe upper fountain of Siloam in the valley of Jehoshaphat, Israel. Coloured lithograph by Louis Haghe after David Roberts… https://www.rawpixel.com/image/13970285/image-person-art-clothingFree Image from public domain licenseDe trap in het Prinsenhof te Delft, waar prins Willem I werd vermoord in 1584 (1827 - 1891) by Johannes Bosboom https://www.rawpixel.com/image/13742709/image-paper-art-public-domainFree Image from public domain licenseBoxley Abbey, Buildings within the Scheduled ancient monument site. (Not open to public)From the time of St Augustine's… https://www.rawpixel.com/image/11176334/image-plant-grass-forestFree Image from public domain licenseRocky wall Kilchurn Castle, Scotland https://www.rawpixel.com/image/1233449/ruins-kilchurn-castleView licenseIngang van grot Crypta Neapolitana (of Grotta di Posillipo) aan de kust van Pozzuoli (1778) by Louis Ducros https://www.rawpixel.com/image/13786810/image-paper-art-watercolorFree Image from public domain licenseRomeinse muur met boog (1782 - 1837) by Pieter Bartholomeusz Barbiers https://www.rawpixel.com/image/13785994/romeinse-muur-met-boog-1782-1837-pieter-bartholomeusz-barbiersFree Image from public domain licenseSt Bartholomew's Priory, London: a vaulted passage. Etching by J. Storer, 1804. https://www.rawpixel.com/image/14017067/bartholomews-priory-london-vaulted-passage-etching-storer-1804Free Image from public domain licenseNankow pass, Pechili province, China. Photograph by John Thomson, 1871. https://www.rawpixel.com/image/13994970/nankow-pass-pechili-province-china-photograph-john-thomson-1871Free Image from public domain licenseMangahao Hydro-Electric scheme - 37th and 38th visits : 1924 (1924) by Leslie Adkin. https://www.rawpixel.com/image/13028668/image-person-water-clothingFree Image from public domain licenseBirdsboro (vicinity), Berks County, Pennsylvania. Cold cellar opening onto the well on the farm of FSA (Farm Security… https://www.rawpixel.com/image/12326027/image-public-domain-wall-archFree Image from public domain licenseCharlotte Amalie, Saint Thomas Island, Virgin Islands. The solitary confinement dungeon in the old fort. Sourced from the… https://www.rawpixel.com/image/12281686/photo-image-shadow-wood-public-domainFree 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 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 license[Untitled photo, possibly related to: Charlotte Amalie, St. Thomas Island, Virgin Islands. One of the inmates of the insane… https://www.rawpixel.com/image/12263266/photo-image-face-person-woodFree Image from public domain licenseStructure of covered bridge. Wallingford, Vermont. Sourced from the Library of Congress. https://www.rawpixel.com/image/12269379/photo-image-wood-public-domain-archFree 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 license