A delegation from the US Congress has been visiting the prison at the Guantanamo Bay naval base in Cuba, amid allegations of human rights abuses there.
More than 500 non-Americans - many captured during the war in Afghanistan and declared "enemy combatants"- are detained at the facility.
The lawmakers were shown cells, like this one with standard issue items.
They witnessed interrogations from behind one-way mirrors.
One of those interrogated was a Saudi national who defence officials claim knew nine of the 11 September hijackers.
The US Representatives joined the troops for lunch, said to be identical to the fare provided to inmates.
White House and Pentagon officials say the inmates are well-treated.
Washington is also keen to play down allegations that Korans have been desecrated at the prison.
Visitors were also shown the now overgrown Camp X-Ray, the original facility at the base set up in January 2002.