Built in the 1830s, the Lockkeeper's House is the oldest building on the National Mall. Pearl Mak/NPR hide caption
national mall national mall
A still frame from a Consumer Product Safety Commission video shows a mannequin's head leaning over an active fireworks display. U.S. CPSC hide caption
A girl visits The Poppy Memorial, a wall of 645,000 poppy flowers to honor the service members who have died since World War I. The USAA made the memorial that stands on the National Mall. Rodney Choice/AP hide caption
Demonstrators hold signs Feb. 19 during a "lie-in" protest supporting gun control reform near the White House. A gun control rally set for Washington on March 24 will be held on Pennsylvania Avenue, not on the National Mall as originally planned. Zach Gibson/Getty Images hide caption
Boys swim in the Lincoln Memorial Reflecting Pool in 1926 despite the fact that it was forbidden. Universal History Archive/UIG via Getty Images hide caption
White House Press Secretary Sean Spicer delivers a statement in the Brady Briefing Room of the White House on Saturday. Mandel Ngan /AFP/Getty Images hide caption
National Geodetic Survey crew members Roy Anderson, left, and Steve Breidenbach set up survey equipment used to measure the height of the Washington Monument. National Geodetic Survey/NOAA hide caption
The man who set himself on fire Friday at the National Mall was John Constantino, 64, of Mount Laurel, N.J., police say. Constantino's family links the act to "a long battle with mental illness." Alex Brandon/AP hide caption
Police investigate the scene after a man set himself ablaze on the National Mall's lawn Friday afternoon in Washington, DC. The man did not survive his injuries, according to reports. Win McNamee/Getty Images hide caption
Newtown, Conn., residents Darren Wagner and Georgia Monaghan traveled to Washington, D.C., to attend the gun control rally on Saturday. Lizzie Chen/NPR hide caption