In this photo taken Oct. 1, 2012, tourists on Segways pass dilapidated benches and fencing blocking a heating grate at John Marshall Park on Pennsylvania Avenue NW in Washington. Washington's Pennsylvania Avenue, sometimes called "America's Main Street," is being listed among the nation's endangered landscapes because of neglect and deferred maintenance by the National Park Service. (AP Photo/Jacquelyn Martin)

Associated Press
In this photo taken Oct. 1, 2012, tourists on Segways pass dilapidated benches and fencing blocking a heating grate at John Marshall Park on Pennsylvania Avenue NW in Washington. Washington's Pennsylvania Avenue, sometimes called "America's Main Street," is being listed among the nation's endangered landscapes because of neglect and deferred maintenance by the National Park Service.  (AP Photo/Jacquelyn Martin)
In this photo taken Oct. 1, 2012, tourists on Segways pass dilapidated benches and fencing blocking a heating grate at John Marshall Park on Pennsylvania Avenue NW in Washington. Washington's Pennsylvania Avenue, sometimes called "America's Main Street," is being listed among the nation's endangered landscapes because of neglect and deferred maintenance by the National Park Service. (AP Photo/Jacquelyn Martin)
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