A monument to an Irish secret society thought to be responsible for a string of violent attacks in Pennsylvania coal mines.

The train collection of an eccentric New England seafood mogul is now a National Historical Site.

A museum dedicated to the history of electric interurban transit near the home of the first electric trolley system in the United States.

Believed to be the birthplace of the United States Marine Corps.

Abandoned blast furnaces are an enduring reminder of Scranton's once booming iron business.

This iconic Lancaster everyman has been reading the same story since 1980.

An underground blaze turned this village into a ghost town.

This national landmark is also home to a massive treehouse.

One of the world's oldest continually operating bookstores.

Hidden behind an empty field resides this early 19th-century cemetery.

America's oldest drive-in movie theater has been in continuous operation since 1934.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

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

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

The oldest surviving presidential residence in the United States.

One of Philadelphia's largest murals resides hidden under this bridge.

One of the oldest of its kind.

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

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

This icon of the Atomic Age now lays dormant.

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

The Home and murder site of the witch of Rehmeyers Hollow.

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