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.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

"Where the ducks walk on fish."

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

Where the oil industry began.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

This collection honors the iconic, and proudly American lighter that just won't quit.

Steepest flood safety railway in the entire world.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This jail which was in service for over a century is now open for curious visitors.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

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

This elaborate towering structure was once famed for its revolutionary height.

An outlandish shoe shaped house built by an eccentric millionaire.

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

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

There aren't too many operational funiculars around, but Pittsburgh has two!

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

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