http://ai.stanford.edu/~latombe/mountain/photo/saudi-arabia-10/khaybar-10.htm
https://www.forbes.com/sites/trevornace/2016/03/02/rainbow-mountains-china-earths-paint-palette/
https://www.condetraveladventures.com/en/rainbow-mountain-cusco-peru-7-color-mountain-vinicunca-ausangate-tour
