Sen. John McCain paid a quiet visit to the "Hanoi Hilton" prison where he was held for more than five years during the Vietnam War on Wednesday, making a few deadpan remarks as he made his way through dark corridors and past musty cells. McCain allowed reporters to follow him while he escorted Sen. Amy Klobuchar of Minnesota and Sen. Lindsey Graham of South Carolina through the prison. Vietnam's communist government has turned the facility into a museum. It was originally used by French colonialists to hold Vietnamese revolutionaries, then used by the North Vietnamese after they took power to house Americans captured during the Vietnam War. The prison was called Hoa Lo but was widely known by the nickname "The Hanoi Hilton" among US soldiers. McCain, the prison's most famous detainee, says he and others were severely tortured during their time there.