5. Sailing stone/moving rock, USA
Death Valley in California is one of the least inhabited places on the planet and also the place where you can spot sailing stones: rocks found at the end of a track in the sand, suggesting that the stones were able to move. There is still no scientific explanation for this geological phenomenon.
6. Blood rain, India
There have been numerous reportings of blood red rain falling from the sky, but the 2001 spotting in Kerala, India may be one of the most well known. The red rainfall was not an extraterrestrial intervention, as many believed then, instead it was caused by the presence of spores in the air and red algae coming from the ocean.