These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

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

An abandoned stretch of highway, deteriorating next to the operational one.

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

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A toxic ghost town sitting atop a massive coal fire.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

World's first "penitentiary," meant to be humane, drove men insane.

Faces carved into the cliffs create an otherworldly walking trail.

This historic Ohio bridge is adorned with fanciful locks left behind by loving couples.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

The site of the worst mining disaster in Ohio's history.

Constructed in 1882, this jail once housed local inmates and the sheriff's family all under one roof.

The headquarters of a pioneering cast iron and cast aluminum cookware company is in ruins, but still standing.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

For decades, this waterfall remained hidden because of an artificial dam.

This schoolhouse for Black American children is one of the oldest remaining in southeastern Ohio.

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

In this relatively flat state the highest point is an honored place.

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

An office built to look like a giant basket.

The ruins of the suspension bridge hang over Kingsbury Run as a ghost of racial prejudice.