This unique historical monument features large concrete spheres designed to resemble fallen stars.

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

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

This nine-story building is the oldest standing skyscraper in D.C.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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

The romance of early commercial flight still fills this Art Deco destination.

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

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

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

The United States Capitol's former columns still stand.

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

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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

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

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

This memorial marks the devastating day that Texas City was destroyed in a daisy chain of exploding ships.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A notorious Route 66 eatery once frequented by Al Capone.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.