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.

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

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

Pittsburgh's literal underground railroad.

Where the oil industry began.

The final resting place of two members of the infamous Doan gang, notorious outlaws and Revolutionary War Loyalists.

A daily replay of the experiment that proved the rotation of the Earth.

Memorializing an American tragedy of massive proportions.

Once used to screen films for theater owners to rent, this historic building is now a start up hub.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

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

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

One of the oldest of its kind.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

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

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

An ideal wedding spot that is almost too ideal.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

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

An Irish Memorial commemorating those who perished due to potato blight.

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