WASHINGTON (CNN) -- The grooved, gray concrete wall rising from a few inches to a few feet seems to be solely for blocking the noise from the nearby highway, but like many parts of the new Pentagon memorial, there is more to the wall than meets the eye. Seven years after the September 11 attack on the Pentagon, the wall is designed to remind visitors of the youngest and oldest victims, wrapping the memorial in symbolic imagery. It stands 3 inches tall at its beginning, representing the youngest person killed there -- 3-year-old Dana Falkenberg -- and continues to a height of 71 inches, corresponding to the oldest victim, retired U.S. Navy Capt. John D. Yamnicky Sr.
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Pentagon unveils 9/11 memorial to honor the 184 victims killed there
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Benches are laid out in a pattern according to the year each victim was born
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Son visits site with dad to honor his mom: "I'm very impressed"
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Watch 9/11 memorials in New York and Washington on CNN.com Live
Just outside the fence, a @placeholder police guard shack is on one side, and a giant earthen berm -- designed to deflect bomb blasts from the Pentagon -- is on another.