O day and night, but this is wondrous strange!
And therefore as a stranger give it welcome.
There are more things in heaven and earth, Horatio,
Than are dreamt of in your philosophy.
Case in point, the rainbow mountains of Zhangye Danxia Landform Geological Park in Gansu, China:
The vivid mountains are the result of mineral deposits and red sandstone from over 24 million years ago. Layers formed on top of one another, creating the colorful patterns of rock strata.
Some of the photos may be color-enhanced (such as this one, perhaps?):
But this one is probably bona fide: