Built hundreds of years ago this downtown iron barrier once protected a much despised king.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

This shop for all your super spy needs hides an educational secret.

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

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Avoid gangster interaction while window-shopping.

A town trapped in time - 1958 to be exact.

Where old school Polish Chicago and young hipster Chicago live side by side.

The curious underground history of keeping Paris clean.

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

A pocket of jungle amidst urban expansion in Panama.

Ride the subways of yesteryear.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.