There was a top secret plan during World War II to seal a group of soldiers inside the rock.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

Eco-friendly island mansion.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

A near tragic event on this bridge helped inspire the classic film "It's a Wonderful Life."

This replica of the Greek structure is in the heart of Nashville.

This award-winning men's bathroom was just too beautiful to not allow women to see.

This supermarket is suspended 25 feet above an interstate highway.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

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

One of America's first spies started out as a teacher in this little red one-room schoolhouse.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

The only sea in the world that has no land boundary.

Be(w)ar(e) the moat around this historic Czech castle.

The largest piece of no man's land left on Earth.

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

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

A line of blue paint marks the route of the inaugural parade.

These giant volcano sponges in Antarctica are thought to be the world's oldest living animal, at 15,000 years old.

This historic steamboat is scuttled just a few hundred feet from where it was built over a hundred years ago.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A daybeacon pyramid is about all that's left of this island that is said to have sunk due to a pirate's curse.