A slot canyon, formed by rushing water through porous rock. In this case, red sandstone. Original image from Carol M.…
https://www.rawpixel.com/image/421963/free-photo-image-arizona-canyons-black-and-white-landscape-photography-grayscaleFree Image from public domain license
Rock texture, Antelope Canyon background for twitter header
Light beams into an Arizona "slot canyon" near Page. Original image from Carol M. Highsmith’s America, Library of…
https://www.rawpixel.com/image/421973/free-photo-image-black-and-white-landscape-photography-background-carol-highsmithFree Image from public domain license