Click the arrow to watch the documentary on YouTube. Video source: PBS YouTube channel.
It's not an old documentary, but the subject matter is.
This week's Retro Saturday is a 2008 PBS documentary titled, Astrospies. It's about the Manned Orbital Laboratory program in the 1960s, essentially a military version of Project Gemini that would spy on the Soviet Union.
About five minutes into the documentary, you're shown the blockhouse at the Cape's Launch Complex 5/6. But then they show you inside — at the Air Force Space & Missile Museum, which is down the field at Launch Complex 26. Two different buildings. Oops.
The Soviets had their own version of MOL, code-named Алмаз (Almaz, or “diamond”). The documentary covers the Soviet program too.