Where the author wrote her beloved "Little House" books.

Before Nixon, "watergate" meant canals.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

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

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

The Grand Canyon of Texas.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

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

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

This otherworldly church spire reaches up toward the heavens.

One of America's first planned communities is preserved in a state park.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

Albuquerque found the perfect use for tumbleweeds at Christmastime.

A computer bug so primitive it was an actual insect.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

An extensive collection of fine art devoted to man's best friend.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.