A search through the Central Intelligence Agency’s archival photography reveals the Agency once classified a picture of a birdhouse.

Was it the ingenious hiding place of a listening device? The most secretive spot on Langley campus? A masterwork of aviary engineering too sensitive to fall into the hands of the Soviets? No clue.

If you know anything that can shed light on the mystery, let us know via email, on Twitter, or via the form below.