This tiny 19th-century tunnel was built so a man could move his cows from one field to another.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

Elvis's own personal tropical hideaway.

The first full-scale tunnel built in America is short but scenic.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Enormous lake at the bottom of a unique cave system.

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

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

This historic steamboat is scuttled just a few hundred feet from where it was built over a hundred years ago.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.

This natural marble cave is one of only five national monuments in Oregon.

A trash dump made beautiful by nature's power.

Sasqu(w)atch out!

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

Canyon walls shrouded in ferns.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

This massive redwood tree has a hole in the base big enough to drive through.