Michael Cremo is one of the few researchers that isn't afraid to continually seek-and-ask the big questions about forbidden-hidden history & the nature of reality. http://www.forbiddenarcheologist.com,
http://www.coasttocoastam.com/show/2013/12/18
https://www.facebook.com/MichaelCremoItsReallyMe,
http://www.mcremo.com/links.htm
http://en.wikipedia.org/wiki/Out-of-place_artifact,
http://www.ancientx.com/nm/anmviewer.asp?a=75,
http://listverse.com/2007/10/01/top-10-out-of-place-artefacts,
http://mentalfloss.com/article/23399/quick-8-eight-out-place-artifacts,
http://www.bibliotecapleyades.net/egipto/esp_electricidad_egipto_1.htm,
http://www.disclose.tv/forum/strange-out-of-place-artifacts-t18737-20.html,
http://www.davidicke.com/forum/showthread.php?t=11442,
http://www.in5d.com/out-of-place-artifacts.html,
http://www.ancient-wisdom.co.uk/ooparts.htm,
http://s8int.com
Science & religion offer many fascinating clues about reality & the metaphysical.
http://www.mysciencemyreligion.com
For many, it would be so disturbing to seriously consider that humans on earth might have made the climb from the stone age to the space age more than once. Then some catastrophic event occurred & almost wiped everything out.
http://rationalwiki.org/wiki/Out-of-place_artifact,
http://skeptoid.com/blog/2013/01/29/the-mystery-of-ooparts,
http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Out-of-place_artifact.html
The Crystal Ball & Crystal Skull, etc.
http://www.strangemag.com/crystalskull/thecrystalskull.html