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

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

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

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

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Dr Barnes' $25 billion private collection of art and arboretum.

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

World's first "penitentiary," meant to be humane, drove men insane.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

This giant disembodied horse head seems to balance impossibly on its nose.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

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

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

Where America's first doomsday cult awaited the end of the world.

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

The most photographed house in Maine looks good enough to eat.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

This small-town Connecticut restaurant gives each diner a free book from its vast library.