Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

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

The "Seinfeld" diner.

Dine on old-school red sauce fare at a former mob hang out and film set for The Sopranos.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

Commemorating the spot where the famous scientist fed his pigeons.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

The first piece of public art dedicated to LGBT rights.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

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

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

A Wisconsin kitsch palace from the 1930s lives its second life in 21st-century Brooklyn.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The most confusing clock in New York.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

Salute the leader of the proletariat.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

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

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

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

A popular European tradition makes its way to the states on one of America's most famous bridges.