I reckon they're hiding a whole bunch of advanced military weapons, nuclear bombs. I Also think they hide any evidence of extra terrestrial life there.

The Wardrobe from narnia is hidden in a underground bunker next to all the aliens and other stuff.

Always wondered about what lies down there. I've watch some documentaries on it, don't believe half the stuff they say, seem to be a bit of a cover up.

I think Area 51 is Narnia, yes thats my final decision! Guys just think about it....

Definitely something we shouldn't know for the better

They hide all the crazy shit there man. Like the old Miley Cyrus and even Bruce Jenner

I think its where we put our nukes and nuclear stuff.

I really think working Jetpacks *_* okay to much GTA SA

i think they hide weapons/ unique tactics and stuff. And i think ist not really bad. I think they know much enough to save more lives / destroy more or whatever but at this Point the world is not really ready to handle These things. My opinion...

get it right people the wardrobe to narnia is the way to area 51 and they hide an army of clowns in the basement along with barney, elvis, john lennin, bob the builder, and of course hitler. the world will end when the clowns come out of the closet! you have been warned

All i think it is, that they it's a top secret advanced military weapons testing ground because they, because they don't know how much damage the weapons they have made are going to do. I also think its filled with ancient findings which help them out build advanced weapons, (EG:Mayans) and trying to find out answers and piecing things together to give us the answers we have always wanted to know.