This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

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

The oldest farmer's market in America is so ancient it was approved by the King of England.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

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

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

A toxic ghost town sitting atop a massive coal fire.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

The failure of one component toppled this entire bridge during rush hour.

Now in disrepair, this 19th century station was a stop on of the famed B&O Railroad.

An office built to look like a giant basket.

The largest ancient burial mound in Ohio.

A castle built by an eccentric medieval enthusiast in suburban Ohio.

Rare recess caves fill this unbelievably beautiful Ohio park.

The largest earthwork effigy in the world.

Where beautiful signs live on forever.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The charming collection celebrates a small Ohio village's Finnish roots.

A monument to the “unrecognized dead” of the tragic 1876 train crash.