Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

One of the most unusual geological features, recognizable from a dozen hit movies.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

A controversial memorial at the place where Captain Cook met his violent end.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This black shoreline is made up of exploded lava particles.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

When ecosystems collide in the arid Southwest.

This metallic stampede sits frozen on a Washington ridge yet the artist's vision is still incomplete.

The magic's in the hole!

The most loyal of little dogs, or a Victorian era publicity stunt?

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Hear the quietest sound from across the dome.

A cluttered and astounding collection of antiquities and curiosities.

Dictionary Johnson’s favorite feline.

An unusual round church in London with a Templar past.

The anatomical-pathological collection of a man who changed surgery.

At 207 feet, one of the world's longest continuous escalators.

The most decorated dog of World War I is preserved in the Smithsonian.

The "lovely red Vega" of the legendary record-settling pilot.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.