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

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

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Gods clash with machines in a power plant regenerated as a museum.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Come for the pastrami, stay for the million-dollar art.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

Abandoned power station once home to a squatter community, now being developed into an arts center.

Ride the subways of yesteryear.

Guerilla gardeners reclaimed this abandoned railroad land literally putting down roots.

A posh members-only club with a literally dramatic history.

One of the last Jazz Age "Wonder Theaters" in New York City.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A graffiti Mecca welcoming artists from around the world.

A hospital where antique dolls are given new life.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This historic cemetery was inaccessible for several years due to dozens of land mines.

Oriental bazaar in the heart of Sarajevo.