This photo was taken in Luxembourg's beautiful Mullerthal.
One of the special features of the Mullerthal is its rock maze, with deep cuts in the rocks, where one can wander through. The rocks, partially by themselves, and partially with the help of mosses, grass, and fungi, are quite colourful. With a bit of light (not too much), the colours come out really nice. Especially when the rockface is still wet / moist from recent rain.
In post, I increased the saturation of the colours slightly, while also increasing the lights of the rockface deeper in the crevice, to also bring their colours into play.