This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

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

A dilapidated dock tells the story of Titanic’s missed arrival.

Elevated freight railway turned wildly successful urban park.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Try not to get slimed in Tribeca.

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.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

The bronze uniforms commemorate the vital role of women during World War II.

The medieval woodcut-style artwork chronicles life in medieval London.

A mysterious shape catches the eye in this 16th-century painting.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

A living memorial to the trees London lost during the Great Storm of 1987.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

The ritual has been performed uninterrupted for nearly 700 years.

The commemorative stone column conceals a secret laboratory.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

These ornate arches show how the course of the River Thames has changed.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

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

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.