On April 15 , 2013 , an envelope that preliminarily tested Testing positive for ricin , a highly toxic protein , was intercepted Preventing_or_letting at the US Capitol 's off-site mail facility in Washington , D.C .

Abraham Lincoln , the 16th President of the United States , was assassinated Killing by well-known stage actor John Wilkes Booth on April 14 , 1865 , while attending Participation the play Participation `` Our American Cousin '' at Ford 's Theatre in Washington , D.C .

The battle Hostile_encounter was fought Hostile_encounter on July 21 , 1861 in Prince William County , Virginia , just north of the city of Manassas and about 25 miles west-southwest of Washington , D.C .

McDowell 's men frantically ran Self_motion without order Arranging in the direction of Washington , D.C .

On May 12 , the band played Competition at the GLAAD Media Awards Social_event in Washington , D.C .

The first show Social_event of the official tour Traveling took place Process_start on June 1 , 2001 , at the in Washington D.C .

The National Equality March was a national political rally Self_motion that occurred Coming_to_be October 11 , 2009 in Washington , D.C .

It took place Process_start on October 28 , 2007 , at the Verizon Center in Washington , D.C .

The woman suffrage parade of 1913 , officially the Woman Suffrage Procession , was the first suffragist parade Social_event in Washington , D.C .

It took place Process_start on December 17 , 2000 at the MCI Center in Washington , D.C .