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We were able to check out the International Space Station Center on NASA's closeup tour and were escorted into secure areas. Still, this sign gave me the heebie-jeebies.
Here's the gangplank leaving the Visitor Center area leading to the ISS Center.
The interior of the ISS Center, where the components of the International Space Station are constructed. In the foreground is a cylindrical supply module which is used to re-supply the space station with food, water, and other consumables. In the background a Japanese science package is being worked on, and it is a separate secure area.