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

Where the lovelorn find a home for their sentimental keepsakes.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

New York City's only preserved family home from the 19th century.

An artist's cute bronze subway sculptures belie his violent artistic past.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

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

One of only two commuter aerial tramways in the United States.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

The celebrated eyesore created by starry-eyed sweethearts.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.