To don't mention the big work as in Nazca,
Gyzeh, Matchu-Pitchu, Teoticluachan, Eastern Island, Stonehenge and
much more. The most representative of all the images from the antiquity
is: The Marsman and the cave art from Peru. Also the racket painting
from Voronet Monastery, Romania, in XVI century is a unexplainable
mystery. The flying Gods from Egypt are also a nice example; no't
to mention the Viracochas of the Inca( detailled described in they're
old scripts). No 't all the observations of this fenomena has to be
true. Some of them has natural causes, like globular flashes, static
electricity, clouds, etc. Also the pictures were made are no't all
true. Some of them has being falsified, or just bad made with bad
intentions. What is more difficult to explain are the 80 hours of
video material tooked in Brazil in 1998/1999. Those movies have being
controlled in special labs, but no falsification could be founded
. In the WW II were UFO's signalized; in more then one attacking mission,
the english and german air forces were surprised by the arrival of
5 UFO's. There was no hostile action from them, even if the two other
armies started to shot. No projectile or bullet could harm them and
the strange aircrafts lefted the aria after 14 minutes. In the non-official
area is also known that 3 missions of Apollo and also of the Space-shuttle
were followed by UFO's.
My favorite subject is:Roswell
(click here
for the site) One of the official investigators of this case
is dr. J. Allen Hynek (ex-director of The Blue Book Project). He
wrote books about UFO's and lies of the officials. Every pilot or
military who came to report a UFO, was asked to keep secret. Who
didn't, was dismissed, discredited, wrongly accused, or killed.
Because my space is to precious to me i will add some more links
below where you can find more about this subject.