This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

An antiquated German apothecary on Chicago's North Side.

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

An enormous park-like oasis, full of famous Chicagoans' graves.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The celebrated eyesore created by starry-eyed sweethearts.

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

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.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

2300-year-old Roman road connecting the empire.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

It was once the base for a series of domestic terror attacks.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The anatomical-pathological collection of a man who changed surgery.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.