The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

A building shaped like the Army Corps of Engineers logo, because why not?

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

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

This poor little statue is the most vandalized memorial in Washington.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Decades before the scandal, this staircase on the river was a literal "water gate."

The span is crooked and made from two older recycled bridges.

A haunting tribute to pioneering photographer Clover Adams.

There's a crumbling old mansion inside the Smithsonian National Zoo.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.