Article: Mansion expansion.

Mount Vernon, the 500-acre estate George Washington once considered home, is now a tourist attraction visited by more than one million people a year. With its sixty-eight buildings and extensive grounds overlooking the Potomac River in Alexandria, Virginia, this landmark offers unique security challenges.

In 1993, Director of Security Frank Duley decided that a security upgrade was needed to ensure the safety of patrons and artifacts. But he needed a solution that would do the job while preserving the historical integrity of the structures and not visibly intrude on a visitor's experience.

To help him construct a security plan, Duley contacted a security ...

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