A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

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.

There must be a pun in this haystack somewhere...

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Nikola Tesla's former home contains an homage hidden from plain sight.

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

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

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

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

A celebration of capitalism in Midtown.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The "Seinfeld" diner.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

New York City's smallest piece of private property.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.