A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The most accurate timepiece in the world.

This groundbreaking 16th-century map is known as "America's birth certificate."

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

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

This statue of the "father of television" stands prominently in the United States Capitol.

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

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

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A much-maligned monument to teetotalism.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

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

In the mountains of West Virginia is this perfectly preserved Art Deco train station.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

The first American department store, and home to the largest operating musical instrument in the world.

Kentucky's anomalous peninsula projecting into the Mississippi River, site of legendary earthquakes and local feuds.

This museum is dedicated to the history and design of purses.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

A superb spot to appreciate the traditional boats of the Indian Ocean.

Whitewashed mosque contains the world's largest carpet.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."