Giant six-pack could provide one person a six-pack a day for 3,351 years.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Time travel with sweets across history at this research-based candy store.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

Through a gap in a chain link fence behind an auto shop is one of Arlington’s oldest family cemeteries.

Situated in a bustling intersection, this "mobile" monument that honors local veterans from five different wars has moved several times but appears to have found its final resting place.

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."

The hidden offices underneath Memorial Bridge have been locked up since 1976.

The national park was once a plantation estate.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

Also known as the Founding Church of Scientology.

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

The only female equestrian statue in Washington, D.C. is a 15th-century French heroine.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

Largest Roman Catholic church in North America.

A haunting tribute to pioneering photographer Clover Adams.

The house where Lincoln drafted the Emancipation Proclamation.

This tiny, one-acre cemetery serves as a reminder of when the Civil War got close to the nation’s capitol.

This American Civil War-era fort still stands near the border between Washington, D.C. and Maryland.