A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

A natural gas leak provides a flickering flame beneath a waterfall.

A forsaken wonder in the middle of the East Side neighborhood.

This public space is speckled with the eerie remnants of a defunct amusement park.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Faces carved into the cliffs create an otherworldly walking trail.

Once a bastion of its community, this gothic cathedral now stands as a haunting ruin.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

This sprawling bookstore spans four floors and has more than a million books in stock.

A collection of witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Take a drunken tour inside the world's largest known geode.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

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

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

Most historians agree that the so-called "Gentleman Pirate" wasn't much of either of those things.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.