Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

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.

This Detroit ruin was once a gothic bastion of its community, but now it 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.