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UNITED STATES - MARCH 29: Although the Capitol Visitor Center opened in December 2008, signs directing visitors to the underground facility have just recently been posted around the Capitol grounds. (Photo By Bill Clark/Roll Call)

UNITED STATES - MARCH 29: Although the Capitol Visitor Center opened in December 2008, signs directing visitors to the underground facility have just recently been posted around the Capitol grounds. (Photo By Bill Clark/Roll Call)

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