The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The celebrated eyesore created by starry-eyed sweethearts.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

There are owls with glowing eyes in Herald Square.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

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

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

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A bit of retro transportation flair preserved in the world's largest department store.

Avoid gangster interaction while window-shopping.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.