This museum collects over a century of automobile history including the iconic car from The Muppet Movie.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

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

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

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The final resting place of one of the most iconic musicians of the '80s.

One of the last few period-correct, hand-operated canal locks in the country.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

For decades, this waterfall remained hidden because of an artificial dam.

The final resting place of the most famous sharpshooter.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

Deep scars on the earth left by the Ice Age.

Where beautiful signs live on forever.

An enormous goose sits atop this nest-shaped home.

Everyone and everything one man ever loved and lost, now stare into the East for all eternity.

Arlington Cemetery exhibit dedicated to death and grieving.

A museum and research center dedicated to preserving the history of Rolls-Royce and Bentley motorcars.

The first of Lancaster's "rural cemeteries."

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

This dramatic rail curve was once the target of a failed Nazi attack.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

The oldest farmer's market in America is so ancient it was approved by the King of England.