A painfully obvious spy house sits right across the street from the Russian Embassy.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The most decorated dog of World War I is preserved in the Smithsonian.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

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

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

The trials and tribulations of marking Poe's grave.

Once America's tallest structure, now a Baltimore landmark.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

This former asylum for Black Americans is haunted by its history of violence and racism.