The site of America's first commercial oil well essentially disappeared after the town went bust.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

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

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

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

It may appear to be a fancy junk yard, but each item has a story to tell and a lesson to impart.

For decades, it has disappeared and reappeared as water levels rise and fall.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

The last street in Pittsburgh that's paved with wood.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

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

It would take 35 firetrucks to fill this enormous glacial pothole.

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

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

The first American department store, and home to the largest operating musical instrument in the world.

In the early 1800s, surgery was also a show.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

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

An office built to look like a giant basket.

A unique collection of military history dating back to the American Revolution.