The Works and the Mine, New Almaden (151) by Carleton Watkins https://www.rawpixel.com/image/14312772/the-works-and-the-mine-new-almaden-151-carleton-watkinsFree Image from public domain licenseThurlow Lodge - Lawn and House. From Barron Cluster. by Carleton Watkins https://www.rawpixel.com/image/14313835/thurlow-lodge-lawn-and-house-from-barron-cluster-carleton-watkinsFree Image from public domain license