https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14012939Edit ImageSaveSaveEditCropCustom TextA man is stopped to pay a toll in order to enter a fort built on clouds. Etching.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 1028 px | 300 dpiLarge JPEG 2952 x 2528 px | 300 dpiFree DownloadA man is stopped to pay a toll in order to enter a fort built on clouds. Etching.More