https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13964040
The Fossa Grande of Mount Vesuvius, showing the deep hollow ways cut by torrents of rainwater. Coloured etching by Pietro Fabris, 1776.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use