This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This pharmacist and his patient greet visitors to the National Community Pharmacists Association.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

The narrowest house in America is seven feet of pure spite.

A former major munitions plant that has been converted into a sprawling art space.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

Built to defend Washington D.C. during the Civil War, this fort became a post-war nucleus for a thriving Black community.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

The rusting remains are visible sticking out of the waters of the Delaware Bay.

Step inside Lucy, the world's largest "elephant."

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

A historic lighthouse steeped in rumors of ghost and pirate stories.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

A mysterious air force base built to resemble a Long Island fishing village.