A kaleidoscopic warehouse-maze of handmade neon signs.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Salute the leader of the proletariat.

This neighborhood grocery houses a treasure trove of Eastern European delights.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

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

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

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

The "Seinfeld" diner.

Sniff the Titan Arum's rotting flesh.

New York City's smallest piece of private property.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A crumbling hospital from the 1850s on Roosevelt Island.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

A gigantic sculpture garden is packed with innovative oddities.