“Invented in Key West, Perfected in Brooklyn."

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

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

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

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

Sniff the Titan Arum's rotting flesh.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The remains of what was once the world's steepest passenger funicular.

Connecticut's shot tower is near the end of its life.

A bright turquoise river cascades beautifully down stepped terraces in southern China.

The embalmed remains of the communist leader lie within a custom crystal coffin.

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

Impossibly life-like natural history models created out of glass by a father and son.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.