To many wealthy Lithuanians, it was just a fancy horseback riding academy. But horses aren't the only things kept in the barn: the CIA had built a secret prison there, where they interrogated (or tortured, your choice of word) suspected al-Qaeda terrorists.
ABC News has the story:
The CIA constructed the prison over the next several months, apparently flying in prefabricated elements from outside Lithuania. The prison opened in Sept. 2004.
According to sources who saw the facility, the riding academy originally consisted of an indoor riding area with a red metallic roof, a stable and a cafe. The CIA built a thick concrete wall inside the riding area. Behind the wall, it built what one Lithuanian source called a "building within a building."
On a series of thick concrete pads, it installed what a source called "prefabricated pods" to house prisoners, each separated from the other by five or six feet. Each pod included a shower, a bed and a toilet. Separate cells were constructed for interrogations.