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

Behold the rickety wooden glory of the world's oldest operating roller coaster.

This dramatic rail curve was once the target of a failed Nazi attack.

Memorializing an American tragedy of massive proportions.

Steepest flood safety railway in the entire world.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

Pennsylvania's own Roswell-style UFO mystery.

A bronze statue of Mister Rogers in the neighborhood where he grew up.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

A well-preserved relic of the industrial age steel and iron works that dotted West Virginia.

This university transit system is a 1970's vision of the future.

Each step is a mere four inches tall, said to be measured by the stride of a woman wearing a hobble skirt.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

This little museum in the town where zombies were born celebrates the living dead.

These disused steel furnaces are now haunting ruins that may one day be a national park.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

The god of wine stares out at passersby on this busy Pittsburgh thoroughfare.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

This secluded walking trail is a hidden gem of a Pittsburgh park.

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