A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

During World War II, this rice mill became a Nazi concentration camp.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

A super-sized promotional trick that is now a D.C. landmark.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

An unusual manor of stunning beauty, born out of a crippling disease.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A haunting tribute to pioneering photographer Clover Adams.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Furniture tries to escape an abandoned building in San Francisco.

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

The graves of a Connecticut family thought to have been plagued by a vampire.

Underground tunnels remain beneath this abandoned mental asylum.

The kind of mixed-up place that drives archaeologists crazy.

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

The loneliest island in New York.