Well...the photo looks to me like old, unfinished storage bunkers. But that's just my opinion on a photo the details of which I can't see clearly and can't enlarge enough.
I also went to the link for "concentration camps." I know some of these places. They ain't.
Grissom AFB, near Peru,Indiana, for instance: it's an AF reserve facility and yes, there is a prison "camp" there -- it's a medium-security facility and part of Indiana's prison system. The Prison has been there now since about 1990, when Grissom got the ax as an active-duty AFB.
Minidoka internment camp, Idaho: see here for the history and some links. I've been there, and there's little there. At the moment the site consists of 73 acres...and the memories of those who were interned or even born there -- some of whom I know.
Elco, Nevada: well, there's Elko, Nevada -- it's where they have the Museum of Western Folklore and hold the big Cowboy Poetry gathering every January. It's a nice play, and not too far from Winnemuca, another site on the list.
Camp [sic] AP Hill, Virginia: first off, it's Ft. AP Hill. There are POW camps there; I've seen them. They are used for training -- as is the entire compound. The "camps" themselves are obviously designed for training, if you go look at them. And you CAN! AP Hill has for quite a few years been the site of the National Boy Scout Jamboree (although the ACLU wants to stop this). When I was there I found that the ONLY areas closed to visiting were those where active firing of weapons were going on (and you could hear the firing). Oh, yeah -- I was there in July, 2002.
Ft. Benjamin Harrison, Indiana: former home of the US Army payroll services. Also the home of groves of the sorta-rare White Walnut tree.
Come on! I'm more concerned about the incineration of nerve gas at Touelle (I'm sure it's spelled wrong) Army Depot in Utah than about rumors of concentration camps that to my certain knowledge have been floating around since the 1960s. Or the nerve gas stored at Newport, Indiana, or at former Army depot just north of Madison, Indiana, or MTBE pollution.