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

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

A no-frills cinephile haven known for showing offbeat, underseen films.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

A modern zoetrope on the New York City subway.

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

Cryptic messages embedded in the New York City sidewalk.

Elevated freight railway turned wildly successful urban park.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

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

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

Love, knishes, and best wishes from this legendary Lower East Side bakery.

One kilometer of thick brass rod laid out before your eyes.

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

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

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

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This peculiar border irregularity is the only way to legally enter Russia without a visa.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.