Rainbow Mountains In China's Danxia Landform Geological Park
The mountains are part of the Zhangye Danxia Landform Geological Park in China. Layers of different colored sandstone and minerals were pressed together over 24 million years and then buckled up by tectonic plates, according to the Telegraph. The formations were shaped into the flowing valleys after thousands of years of rain and wind, and the region has been listed as a UNESCO World Heritage site since 2010.
Here's a photo showing some detail of the rich "layer cake" action going on.
While the photos are certainly incredible, there could be some slight photo manipulation going on to make the colors pop a bit more than they would naturally. This Flickr photo could be a more accurate representation, but still, the mountains are amazing.