Potomac, Maryland
Maryland Gold Mine Ruins
The ruins of this long-abandoned unsuccessful gold mine can still be found.
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Places I've been
Places this traveler has marked as been there.
Poolesville, Maryland
Seneca Quarry
This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.
Permanently Closed
Boyds, Maryland
Winderbourne Mansion
This abandoned Victorian-style house was built in 1884.
Germantown, Maryland
Earthoid Water Tank
The whole world in one water tank.
Gaithersburg, Maryland
Gaithersburg Latitude Observatory
Tiny observatory made big contributions to the study of the Earth's motion.
Gaithersburg, Maryland
Nike Missile Site W-92
Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.
Washington, D.C.
Marilyn Monroe Mural
A tribute to the pop culture icon overlooks this Washington D.C. intersection.
Washington, D.C.
Dumbarton Oaks
The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.
Washington, D.C.
Gun Barrel Fence
This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.
Washington, D.C.
Tudor Place
A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.
Permanently Closed
Washington, D.C.
Church of Two Worlds
A Spiritualist house of worship where believers communicate with the dead in the spirit world.
Washington, D.C.
Georgetown's Haunted Halcyon House
This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.
Washington, D.C.
Freezing Newsmen Plaque
A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.
Washington, D.C.
The Tabulating Machine Co.
The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.
Alexandria, Virginia
South Boundary Stone of Washington, DC
America's first federal monument.
Fort Washington, Maryland
Fort Washington
This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.
Washington, D.C.
American University Experiment Station
The school tested mustard gas for the U.S. Army during World War I.
Washington, D.C.
FBI Spy House
A painfully obvious spy house sits right across the street from the Russian Embassy.
Washington, D.C.
USNO Master Clock
The most accurate timepiece in the world.
Washington, D.C.
Churchill and Mandela Call and Response
When it comes to handsignals (and colonialism) rock always beats scissors.
Washington, D.C.
The Lindens
The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.
Washington, D.C.
Strom Party Animal
A public art jibe at one of the United States’ oldest and longest-serving senators.
Washington, D.C.
Embassy Gulf Service Center
Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.
Washington, D.C.
The Mansion on O Street
With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.
