No there is no such thing, they are mythical, meaning not real.
No.
Yes, many.
No nobody has ever reported a sighting of him ever
All UFO sightings are unexplainable, otherwise they wouldn't be unidentified.
Yes, I have witnessed 3 sightings in the Almeria region of Spain.
bfro has the state of Alabama in its pages. in the retaled links box below I posted the link.
Most sighting point to that direction but diurnal sighting has also been recorded.
The first "sighting" of Stonehenge was when it was built. Since that time it has remained in the same location, which has been common knowledge. It has never been lost or rediscovered.
Yes, Ufos have been reported in australia.
On March 24, 2011, over Southhampton, England, a triangular, black UFO sighting in broad daylight.
Not every zombie sighting has been recorded, but some of the recorded ones go way back before the 1800's.
We don't know if Nessie was really "seen," as real existence has not been proven. The last claimed sighting was in 2007.