One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Sniff the Titan Arum's rotting flesh.

The "Seinfeld" diner.

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

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

Elevated freight railway turned wildly successful urban park.

A semi-scholarly approach to sex.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Try not to get slimed in Tribeca.

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

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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

A crumbling hospital from the 1850s on Roosevelt Island.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

This pebble beach is so beautiful that taking its rocks is against the law.

This cave holds a surprisingly colorful variety of geological oddities.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

"Looks so real, it's scary!"

A bizarre house filled with an astounding array of collections.

A tragic mystery left this boy nameless for 65 years.

The abandoned coal loading dock is a canvas for unsanctioned art.