The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

The picturesque southern city served as the zombie-filled town of Woodbury in 'The Walking Dead.'

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

A stockpile of childhood lunch pails turned collectibles.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A crumbling hospital from the 1850s on Roosevelt Island.

A quintet of history museums make this Virginia graveyard as much a resting place for funereal history as it is for people.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

When ecosystems collide in the arid Southwest.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Limestone caves with spectacular showcase chambers.

A spiritual vortex among the red rocks in Sedona.

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

Rippling sand dunes frozen in the Arizona rock.

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