>> shawali khan's description is matched others. known as an old brick factory. said he can take us there. >> there is an airport there? >> exactly. now we'll make a turn. >> to the left? >> to the left. >> it's no longer a cia black site but the area is still used by afghan intelligence. >> it is still a secret place, they don't want he anyone inside. >> what happens if we're found? >> we would be definitely arrested. >> it is impossible to confirm the exact location. but kai says most afghans believe what detainees refer to as the black prison was once here. >> the first tower is the security guard. >> that's the perimeter of the base? >> yes. >> from satellite maps it looks like the original factory building is gone. a new collection of buildings, the white ones you see in the distance. >> that over there? that's the exact spot? >> the exact spot. >> hmm . >> it's eerie to be here . when other men arrived here in hoods and shackles. if you were driving around here on any given day it's like none of this ever happened. okay so it's obviously a highly secure loc