- The CIA's headquarters in Virginia holds a collection of valuable abstract paintings
- It is among the most important modern art collections owned by the U.S. government
- Artist Joby Barron spent seven years investigating the artworks
- Her findings -- or lack of them -- are now part of an exhibition
(CNN)The CIA's fortress headquarters in Langley, Virginia is home to more than few surprises, like a branch of Starbucks where the baristas definitely don't ask names, and a museum of spying you'll never set foot in.