Some of the most guarded conversations in Washington take place inside the hardened vaults known as SCIFs.
The redevelopment project will transform the neighborhood east of Howard University with the addition of 600 housing units, a park, new commercial space, and expanded offices for the nearby Children's Hospital.
“Raw water” came in from the reservoir and slowly percolated through the sand filters in 25 vaulted underground cells before making its way out into District taps.
FDR traveled around the country during World War II in an armored train car named the Ferdinand Magellan.
Over the past 75 years, just about every Navy warship has spent some time, in miniature form, in this pool in Bethesda.
Fort Washington is one of the more interesting military history sites in the Washington region. Until the Civil War it was the only defensive fortification in the area.
The Torpedo Factory in Alexandria is a visual arts center located in an old Department of Defense munitions facility. The U.S. Naval Torpedo Station was built during World War I.
The forested island we know today was covered with fields of carefully laid out crops.
Kriegsschauplatz von Nord-America (War plan of North America) is aerial perspective drawing showing Washington DC just before the Civil War.
An amusing historic snafu - dubbed L’Effaire Elkton by the press - completely disrupted the diplomatic relationship between the US and Iran for three years. The story begins out in Elkton, Maryland in 1936 on the night before Thanksgiving.