An eerie, decaying ghost town destined to fade into the forest.

A nostalgic bibliographic gem.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

Art deco landmark on the outskirts of Washington, D.C.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

Washington's iconic carousel has a nice piece of Civil Rights history.

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.

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Obscure Freemasons still live in D.C.’s largest private residence.

A historic neighborhood church is reborn as a psychedelic arts collective.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A wondrous old library overlooking the nation's capital.

This grand gothic brewery has been pumping out suds for over a hundred years.

Home to items never before seen by the public.