Looks like a very long lens to me, as the perspective looks very compressed.
It's often used on rows of picturesque houses hugging a hillside to make them all look like they are in the same plane, giving a very "painting-like" effect.
It's an effective artistic trick because as you've noticed, it looks very unlike what you would see with the naked eye.
EDIT: The wider crop of the desert image in the comments shows that if the landscape itself is weird enough, any photographic technique will make it continue to look weird :)
In fact, cropping will give an identical effect to a long lens, although obviously with a reduction in pixel resolution, which will be pretty dramatic if you are trying to duplicate the effect of a very long lens.