I took the Canine Exit 10, and got a bit confused as the which direction to take once I got off. There is an NSA Vistitors Center to the far far right, and the museum road is to the far far left (follow signs for gas station, frontage road.) There might even be a special exit a bit up the road but I missed it. This museum is math and crypto heaven, which meant most of the display were way over my head but made me feel super patriotic. Great gift shop filled with NSA merchandise, pens, logo magnets, coffee cups, etc. It was a fun way to kill an hour in between events for me, might be a several hour trip for someone who is actually a crypto talent.
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