The claim: located north of Harrisburg. Used for WWII POW camp and renovated by Jimmy Carter. Was used to hold Cubans during Mariel boat lift.
What it really is: The base is a National Guard training center, and is controlled by the Pennsylvania National Guard.
It is true that the site was used as a POW camp, and was used to hold Cuban refugees after the Mariel boatlift. What is not true however is that there is a prison camp there. I've taken a look at the site using Google maps, and there is nothing there that looks like a prison camp.