Yo, Adrian!

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

The abandoned coal loading dock is a canvas for unsanctioned art.

In the early 1800s, surgery was also a show.

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

The oldest surviving botanic garden in the United States.

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

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

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

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

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

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

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

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

This mysterious hill seems to pull objects uphill.

The first spinning jail built in the United States is the only one that still turns.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A table rock formation that has been intriguing West Virginians for years.

A rare particle accelerator with a tremendous energy range is tucked away at Ohio University.