This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

European castle ruins in an American state park are actually the product of death and grief.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Human-made caves excavated to hide a secret society of wealthy pagans.

Sloth rehabilitation center in the jungle of Costa Rica.

One person's lost luggage is another person's treasure.

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

California's oldest wind harp represents a historic piece of America's Danish history.

A large instrument played by the wind.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.