This object was found in Romania roughly 30 ft underground. Chemists have determined that this mysterious object is made out of 90% aluminum, and experts say it could date back 250,000 years. Metallic aluminum was not used by humanity until about 200 years ago. Could this be extra terrestrial? What are your thoughts on this? http://www.mirror.co.uk/news/weird-news/experts-believe-mysterious-aluminium-object-9086060
I had never heard of this before now. I found an entry for the object, called "The Wedge of Auid", on RationalWiki and there is a more mundane theory as to the object's origin. http://rationalwiki.org/wiki/Wedge_of_Aiud
My personal belief is that this world has already been through one cycle (or more) of civilization. And we probably found a way to destroy the world back then just as we are now.
"There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy". - Hamlet (1.5.167-8), Hamlet to Horatio
Hard to say, but I've certainly eaten a lump of blue cheese that was skankier looking than that, and survived to tell the tale