National Mall and Memorial Parks is an open-area national park in downtown Washington, D.C. It includes the Thomas Jefferson, Lincoln and Franklin Delano Roosevelt Memorials as well as the World War II Memorial, the Korean War Veteran’s Memorial and the Vietnam Veteran’s Memorial, Pets are allowed on the National Mall and Memorial Parks but must be kept on a leash at all times. Pets are not allowed in any of the museums or institutions.
More information on the National Mall and Memorial Parks pet policy