Interesting comments - I love contempt prior to investigation - I have no reason to believe that any of these were real or that they were fake.  

Sightings of UFO's - well "Project Blue Book" determined that the vast majority of the sightings of UFO's were explained by other means, but that left several (hundred) unexplained.  Now whether or not UFO's carry aliens or were remotely operated - we sent quite a few unmanned crafts before we sent a manned craft.  

Alien abductions? If we found a sentient life form in the form of a mammal on another planet would we take it home and test it in our labs?  Would they call them abductions or collecting specimens?

Big Foot, Sasquatch, Abominable Snowman/Yetti .  Why not.  We are still finding specimens of other animals that were never known before - and with all our intelligence (??) we haven't attempted infa-red scans of the planet in areas they are sighted to see what can be found.  Maybe they are not dumb animals that wish to be found by us civilized persons.

Atlantis - being a parable for Plato to teach us about interaction? Not likely.  Of course Pompey was thought of as a myth until we found it.

Of course, with all of our intelligence and wisdom and knowledge - the planet was flat until 1500, the sun revolved around the earth and there were just 7 planets in our solar system - if people were meant to fly they would have wings and super highways weren't built until the 1950's.  And Bill Gates himself said there was no reason whatsoever to think that we would ever need more than 640 KB of RAM in a computer.  

It seems our intelligence fails us when we forget we are human.  

stan

Myth fact or fiction I believe to be superfluous. This drive to cut the world up into little pieces in the name of science is not always helpful. If big foot is out there let him sleep well tonight knowing that the 'humans" aren't coming to get him.