This stately 19th century library pushed architectural boundaries at a time when the public library movement was just taking off.

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

These lush botanical gardens employ the most purrfect pest control force.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

This public park was the site of the largest civilian disaster of the Civil War.

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

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

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.

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

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

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

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

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

This park contains a number of standing stones meant to heal and inspire.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.