This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

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

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

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

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A self-built castle made by a mysterious man.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

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

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The first memorial dedicated solely to the Black troops who fought for the Union.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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