Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

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

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

A bit of retro transportation flair preserved in the world's largest department store.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Tucked in the back of this amazing antique store is an important piece of medical history.

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

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

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

A terrific purveyor of natural history objects and curios.

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.

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