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

The trials and tribulations of marking Poe's grave.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

This free, take-a-book shop seems like a trick but isn't.

Eighteen miniature death-scene dioramas.

One of the last mosaic tile facades found in the city.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

Atop this media building, two hives containing more than 30,000 bees keep the surrounding area vibrant.

Before Nixon, "watergate" meant canals.

Go take a picture with the inventor of the daguerreotype photographic process.

A clone of a cloned tree that was so important it allegedly had its own guards.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

A haunting tribute to pioneering photographer Clover Adams.

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.

A computer bug so primitive it was an actual insect.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.