A formerly abandoned mental institute, now back in business.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

The site of a tragic massacre that spawned a multimedia franchise.

A brush maker used his factory to protect blind Jews from the Gestapo.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

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

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

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

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

Yo, Adrian!

The oldest surviving botanic garden in the United States.

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

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

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

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

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

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

The world’s first penitentiary, meant to be humane, drove men insane.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.