At least some of humanity have chosen not to close their eyes and minds to extraordinary findings. Watch this slideshow: http://projectavalon.net/lang/en/klaus_dona_en.html
Besides the artifacts which our current technology cannot help manufacture, there are skeletons of 2.6 m long, old maps of the world carved into stone, the Peri Reis map showing the continent of Antarctica (some of which is under sea level - how could ancient people know this?), and much more.
Some photos: http://www.google.nl/images?hl=nl&source=imghp&biw=799&...
Website of Klaus Dona: http://unsolved-mysteries.info/english/retro/e02_01_frame.htm
"Klaus Dona comes from the art world. As Art Exhibition Curator for the Habsburg Haus of Austria, Klaus has organized exhibitions world wide. With this background his approach to archeology is unconventional. He has traveled the world in search of unique and unexplained findings. Intrepid and unrelenting, he is on a mission to bring to the eye of the public such finds as giant bones, crystal skulls, carvings and sculptures in forms that do not fit into the contemporary view of our timeline. We spent an afternoon with Klaus in Vienna talking at length about his process, his particularly stunning finds and why he is motivated to pursue this unusual vocation. Staunchly open minded, he refuses to retreat in the face of skepticism and doubt. Low on funding, he presses on to discover the real mysteries, going down through the centuries and excavating artifacts that science does not allow for, revealing the existence of physical proof that humanity has barely grazed the surface of our heritage here on Earth. (Kerry Cassidy 28 January 2010)"