In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, women cross an intersection in Washington, D.C, possibly en route to a demonstration against the Vietnam War, held in front of the north gate of the White House.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march near Pershing Park, likely en route to a demonstration held outside of the north gate of the White House. The Treasury Building and the historic Hotel Washington are visible in the background. The hotel was renamed the W Washington D.C. in 2009.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march near Pershing Park, likely en route to a demonstration held outside of the north gate of the White House. The Treasury Building and the historic Hotel Washington are visible in the background. The hotel was renamed the W Washington D.C. in 2009.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

In this photograph, taken in December 1969 by National Geographic photographer Joseph J. Scherschel, Vietnam War protesters march along Pennsylvania Avenue. The demonstrators carry signs bearing the names of servicemen from various states who were likely killed in action.

This is a photograph taken by National Geographic Service photographer James P. Blair of the Vietnam protestors lining the North Gates of the White House in June 1966 during the Lyndon B. Johnson administration.