In 1972, former CIA Executive Director William Colby proposed that the spy agency set up an employee museum as a way to share the unique mission and the impact that CIA had around the world.

It took 16 years for it to come to fruition. And some 34 years after that, a new museum expansion and renovation is helping the Agency mark its 75th Anniversary.

Now, the museum hosts artifacts from some of the Agency's most successful – and some unsuccessful missions.

In this episode of The State Secrets Podcast, Cipher Brief CEO & Publisher Suzanne Kelly sits down with the CIA's Curator of Secrets – Museum Director Robert Byer, who gave The Cipher Brief team a tour of the new space and the new exhibits. Some of them stretch back to the days of the OSS – the World War II Precursor to CIA. And some, were used in active intelligence operations as recently as this summer. All have been declassified.

Here's a peek inside the world's most secretive museum at CIA Headquarters, and Suzanne Kelly's conversation with Museum Director Robert Byer.