Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

A collection of unique outdoor sculptures surounded by the beauty of nature.

An American flag was erected for every day that passed during the Iranian Hostage Crisis.

"Where the ducks walk on fish."

Where the oil industry began.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

A quirky collection of outsider art made from automobile parts.

The only statue of its kind to commemorate Washington's beginnings as an officer of the British Colonial Militia.

This demolished goliath of American industry once loomed over the depressed town it once made thrive.

An art deco ice cream shop covered in vintage train station tiles.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.