The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

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

These ornate manhole covers were used for a now-forgotten purpose.

This slender three-story building has also had several famous residents.

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

New York City's smallest piece of private property.

Jimi Hendrix's legendary recording studio in Greenwich Village.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

A very classy 1920s-era bar right in Grand Central Station.

An artist's cute bronze subway sculptures belie his violent artistic past.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

A whimsical, but often overlooked clock in Park Avenue.

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

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

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

Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

Paris' linguistic guide to the international language of, yes, love.

This Parisian café is dedicated to great tea and the art of knitting.

A colorful square marks the heart of the city's LGBTQ community.

An underground magnet for ever-changing street art.

Unruly residents were housed in this one-person cell until the Black Maria arrived.

An unusual art exhibition in a suburban yard is designed to awaken the souls of those flowing by.

A late-night restaurant empire was launched from this humble storefront.