The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

Its columns were all carved from the same white oak tree.

Immortalized in bronze, this frazzled student will be glued to his screen for centuries.

Underneath the bustling city streets, a hydroponic farm grows unique herbs in an urban oasis.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

Richly symbolic public artworks that have been reconfigured for the 21st century.

The secret behind these nostalgic light fixtures: They're not as old as they may seem.

A no-frills cinephile haven known for showing offbeat, underseen films.

One of the few Glatt kosher delis in the United States is a cornerstone of its Hasidic neighborhood.

"Leave a He-Man, Take a Transformer" and share a story about your real-life superhero.

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

A Manhattan tombstone honors a popular 19th-century heroine, now long forgotten.

A touching tribute to the "Queen of Soul."

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Prove you deserve to be fed by Kenny Shopsin.

This elaborate towering structure was once famed for its revolutionary height.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Home to some of the last true noodle artisans in New York.

Cooks at this tiny takeout spot grind their rice flour in a stone mill each morning for perfect cheung fun.

Cryptic messages embedded in the New York City sidewalk.

A vast city of the dead, where the deceased outnumber the living by more than a million.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

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

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