This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A museum now occupies the mansion in Samoa where the prolific Scottish writer chose to spend the last years of his life.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Stonehenge has nothing on Castlerigg’s views.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

Have a seat with the father of modern computing at this Manchester monument.

The television series' iconic giant foot was borrowed from this classical painting.

The only diamond mine in the world where you can keep what you find.

A humble homemade ride attracts visitors from around the globe to this small Midwestern town.

Tubing through a cave lit with glowworms is a magical underground experience.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The largest source of fossilized insects anywhere.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Meet the world's longest tapeworm in a collection that really gets under your skin.

"There's nothing there," and other lies the KGB told us.

The crash of this great airship signaled the beginning of the end for dirigibles.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

The humble fort that saved Washington.