A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The video game-themed street art first popped up in the French city.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

America's first federal monument.

Built by the patriotic residents of Boonsboro in a single day.

A priceless collection of the Nation's cryptologic history.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The national park was once a plantation estate.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A trading post in the North Pole where children send letters.

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

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

There’s a hidden military meme engraved on the World War II Memorial.

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

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

An overlooked memorial honoring the local Washington residents who died in World War I.

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

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.