Barren rock folds in a canyon. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3290890/free-photo-image-aerial-view-architecture-basinFree Image from public domain licenseInterior of Redoubt Zabriskie on Cobb's Hill; wounded rebel picket in the foreground; Rebel picket hill in the distance. by… https://www.rawpixel.com/image/14286397/photo-image-public-domain-nature-envelopeFree Image from public domain licenseRedoubt Zabriskie on Cobb's Hill to Protect Signal Tower, showing the abattis. by Edward and Henry T Anthony and Co https://www.rawpixel.com/image/14286601/photo-image-plant-grass-public-domainFree Image from public domain license