An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

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

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

Washington's iconic carousel has a nice piece of Civil Rights history.

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

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Perhaps the most scandalous statue of America's first president.

The "lovely red Vega" of the legendary record-settling pilot.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

Home to items never before seen by the public.

Quite simply the largest tree in the world (by volume).

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

In an odd geographic anomaly this city borders two different states on opposite sides of town.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

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

An innovative attempt to break a siege in the American Civil War still scars the earth today.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

See massive fossils that are over 200 million years old in northeastern Arizona.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

"We Seceded Where Others Failed."

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.