Ever heard of the moving rocks, sailing stones or sliding rocks of Death Valley? No?
Ok, imagine this: A desert like region (Racetrack Playa at the Death Valley) that has nothing but bare landscapes and a bunch of rocks laying around.
Noone goes there and there are no animals around. But somehow, mysteriously, you can see stuff like this there:

See, and the thing is: you didn’t move the rock. No one did. But the tracks are still there.
Can you imagine the ammount of paranormal, weird, maybe even religious explaining people tried to give it?

The winds are pretty strong there, but given the size of the rocks moving around, wind alone can’t explain the phenomena.

If there’s noone to watch those rocks in the desert, will they move without making a sound?
Anyways, for years the rock movement intrigued scientists and curious people around the world.

Not wanting to ruin the magic for you, but here’s the most accepted explanation:

Such interesting places here on Earth to see… almost looks like an alien planet.
It’s interesting how after knowing about these moving rocks, I realized how many cartoons I watched as a kid had references of them…

Source: pics from Wikipedia, video from TechEBlog