15 January 2017
Vinicunca (Rainbow Mountain), Peru
Located just 3 hours from Cusco, but comparatively unknown until recent years when climate change caused the overlying snow to melt and reveal the colorful formation. More photos at Google Images.
Further discussion and relevant links at the EarthPorn subreddit.
Tip: "there are locals with horses that charge $20-30 to take you to the top." Useful to know because the hike begins at an altitude of 14,000 feet and rises to 17,000 feet where the above photo was taken.