A super-sized promotional trick that is now a D.C. landmark.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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

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

The United States Capitol's former columns still stand.

An astounding collection of medical specimens, including bits of President Lincoln.

A toxic ghost town sitting atop a massive coal fire.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

This abandoned sea fort has become an accidental bird sanctuary.

A priceless collection of the Nation's cryptologic history.

Eighteen miniature death-scene dioramas.

The trials and tribulations of marking Poe's grave.

Walk through the history of American pop culture.

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

Meet some of the most prominent figures in Black history through life-sized wax models.

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