World's largest bell sits on the grounds of the Kremlin in Moscow.

Single runway interrupted by a busy road that cuts across its middle.

Steepest flood safety railway in the entire world.

Memorializing an American tragedy of massive proportions.

The oldest continuously inhabited street in America.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Home of Philip Johnson, one of the 20th century's most influential architects.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The famous author's cottage hideaway.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

The home of aviation trailblazers, in a remote corner of the big city.

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.

Visit the monolithic tomb of America's most famous general.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Holding the most bodies of any cemetery in the United States.

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

Slyly buy a shake in the Parker Meridien lobby.

A celebration of capitalism in Midtown.

A modern addition to the Greenpoint skyline.

Nature and beauty amidst pollution and industrial wreckage.

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

Commemorating the spot where the famous scientist fed his pigeons.