This innocent-looking townhome is actually a subway exit.

Once America's longest-manned military fort, now an abandoned hulk.

A living archive of urban activism and space reclaimed.

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

A quiet and contemplative oasis in the middle of New York's bustle and riot.

Slyly buy a shake in the Parker Meridien lobby.

Peek through the gates at this oasis from the city, full of Old English charm.

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

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

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

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

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A semi-scholarly approach to sex.

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

Elevated freight railway turned wildly successful urban park.

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

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

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

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

An old spiral fire escape dangles above a public courtyard in Midtown Oklahoma City.

Celebrate the history of the rich and truly misunderstood relationship between man and pigeon.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."