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

The site of one of history's most indelible and horrific tragedies.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

Gang fights don't just happen on the streets, they happen under them too.

This abandoned sea fort has become an accidental bird sanctuary.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

A once-booming railroad left abandoned next to the Quinnipiac River marshes now intersects with a hiking trail.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

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

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

A small cave hidden deep within the Jenny Jump State Forest.

Mysterious rocks that ring musically when struck.

One of the oldest of its kind.

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.

A derelict bit of transportation infrastructure hidden in the woods.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

A historic cemetery filled with quirky faux wood art and unique tombstones.

The real-life site of Ichabod Crane's infamous gourd attack.

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

A rural colonial settlement that contains the remains of a store and cooper.