A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

Bowl in splendor, if you're lucky.

Detailed facade of a brownstone in Boerum Hill.

Abandoned power station once home to a squatter community, now being developed into an arts center.

The famous author's cottage hideaway.

The loneliest island in New York.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A celebration of capitalism in Midtown.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

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

The "Seinfeld" diner.

A hip bar decorated with walls of golden skulls.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

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

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Try not to get slimed in Tribeca.