It is the perhaps the most unusual - and exclusive - museum in the world, filled with artefacts that have shaped history. But its doors are firmly shut to the public. It is the only place a visitor can see the gun found with Osama bin Laden when he was killed, next to Saddam Hussein's leather jacket. Welcome to the CIA's secret in-house museum. Located inside the US intelligence agency's headquarters in Langley, Virginia, the collection has just been renovated to mark the agenc...