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

Follow the steps, and this roadside artwork will teach you how to dance.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

The longest non-mortared wall in the country is one man's tribute to his displaced Yuchi ancestor's five-year journey to her homeland.

The famous Beatle secretly visited this Illinois town several times to visit his sister.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

One of the world's earliest skyscrapers.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

Less a museum than a bizarre fantasy world created by artists and engineers.

The world's longest known cave system.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

One of the greatest boxers and humanitarians to ever live chose his hometown as his final resting place.

This 12-foot bronze statue pays tribute to his early days in Kentucky.

The alley connecting two of country music’s most historic venues has a rich history of its own.

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

This giant iron playfully pays tribute to an early 20th-century architectural trend.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The last location where Buddy Holly, Ritchie Valens, and J. P. "The Big Bopper" Richardson played before their tragic deaths.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.