There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

This grand gothic brewery has been pumping out suds for over a hundred years.

The United States Capitol's former columns still stand.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.

For nearly a year, General Ulysses S. Grant was based here during the American Civil War.

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

The U.S. Army's giant warehouse of war art includes Hitler’s watercolors and Norman Rockwell oil paintings.

The maritime museum that boasts the largest nautical library in the western hemisphere.

A museum dedicated exclusively to aircraft used in the military.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

America's first federal monument.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

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

Once on display alongside a giant Gumby, it’s as tall as a nine-story building when fully extended.

One street divides a single town that stands in two U.S. states.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.