The highlight of the museum is the functional Enigma: an electro-mechanical rotor machine used for the encryption and decryption of messages by the Germans in World War II. The simple and nondescript machine is capable of producing 10^114 possible configurations, a feat the Germans wrongly believed would overwhelm any brute force attack needed to break the code. The museum's machine, unlike those on display elsewhere, can be used by visitors interested in encrypting and decrypting their own messages. The Allied efforts in breaking the code pulled in Alan Turing among other British cryptologists, as well as the code breaking Bombe machines produced by Women Accepted for Volunteer Emergency Service (WAVES).

Not everything is stuck in World War II. The museum contains pieces from most major wars of the 19th and 20th centuries including the Civil War, World War I, the Korean War, Vietnam and the Cold War.

The displays humanize and, at times, justify the shadowy agency that may or may not be listening to your phone calls. Unlike the NSA of the '50s and '60s, which went by the name No Such Agency and would, upon questioning, claim to not exist, the National Cryptologic Museum paints a portrait of an agency that wishes it could break its self-imposed obscurity.

When asked to define the primary function of the museum, curator Patrick Weadon responded that it was to "help people understand the critical role the making and breaking of codes has played throughout history" and "extrapolate from that how important the present day mission is."

And extrapolate you must because the museum's collection mysteriously ends around the 1990s, and is curated in a way that manages to avoid any lingering controversy or unseemliness.

Don't let that stop you from visiting as this museum is a must-see for any cryptologic fans or tech nerds. There is no entrance fee and it's open Monday through Friday 9:00 a.m.-4:00 p.m. A parting word of advice: don't rely on GPS to guide you there. Mine got seriously confused when approaching Fort Meade, which I hope is a security feature and not just a mundane coincidence.

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