This curious headstone is labeled simply as "The Queen."

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

One-layer pyramid in Indiana.

All that's left of the quintessential "cabin in the woods."

The longest navigable underground river in the United States is home to countless blind and albino animals.

An abandoned town is hidden in Great Smoky Mountains National Park.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Over 200 people were buried here with only a small stone to mark their final resting place.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

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

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

The only freestanding table rock formation east of the Mississippi.

A historic hotel library in Indiana hides more than a few secrets on its shelves.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

This huge clock made of flowers and simple machinery was once used a political weapon.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

Mile-long cave system near Great Smoky Mountains.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Symbolic attempt to overcome the issues of life.

An impressive collection is dedicated to the legendary beast.

One man's vision and a labor of love of many.

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

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

A historic dam made famous for its turbines and feature in a Hollywood classic.