Click the arrow to watch a film clip of the Gemini 11 launch. Video source: okrajoe YouTube channel.
Known informally as the White Room (for the color inside, not outside), it was where the astronauts entered the Gemini spacecraft atop the Titan II booster.
The White Room was restored and moved to the Museum grounds in September 2003. Eleven years later, it slowly succumbs to the elements, absent funding to maintain it.
But you can still walk around the structure and crawl inside to take photos, which are below.