The "Seinfeld" diner.

New York's oldest and possibly grandest keeper of books.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A terrific purveyor of natural history objects and curios.

Century-old shop, specializing in Occult products.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

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

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

Yo, Adrian!

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

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A layered tribute to the work of mosaicist Isaiah Zagar.

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

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

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

This abandoned train tunnel has been the subject of countless ghost stories for years.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.