The small cave that housed Tennessee's "first citizen."

Home of an evil witch famous within southern folklore.

More than five miles of underground passageways.

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

These medieval tunnels provided water to the city above through centuries of civil war and plague.

A town whose main resource was blue asbestos... what could possibly go wrong?

Here lies Lilly E. Gray, an alleged "victim of the beast," but the reason long remained a mystery.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

"There's nothing there," and other lies the KGB told us.

Overgrown ruins of a turn of the century island fort that sees very few visitors.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

The world's largest collection of ticks.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

How did the right arm of a 13th-century English bishop wind up in a Connecticut church?

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A monument to the military service of America's greatest traitor refuses to even name him.

A skeletal collection of former nautical mainstays.