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

This colonial mansion has been home to a staggering number of American historic figures.

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

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

Where the oil industry began.

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

Memorializing an American tragedy of massive proportions.

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

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

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

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

This historic old movie house was the scene of one of the Blob's most iconic attacks.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

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

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

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

A field of nothing but boulders which resembles a giant's gravel driveway.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Steepest flood safety railway in the entire world.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.