The walls of the iconic dome are hollow and have a secret stairway.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

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

Home to items never before seen by the public.

The United States Capitol's former columns still stand.

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

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

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

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

The trials and tribulations of marking Poe's grave.

This abandoned sea fort has become an accidental bird sanctuary.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

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

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

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Remnants of a storybook amusement park hidden behind a strip mall.

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