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

Annual Easter display made up of thousands of hand-painted eggs.

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.

An abandoned munitions factory with a shot tower continues to wage war on the surrounding environment.

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.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

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.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

This church in Pittsburgh is home to the largest collection of religious relics in North America.