New York City's smallest piece of private property.

This slender three-story building has also had several famous residents.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

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

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

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

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

The only gallery in New York dedicated to olfactory art and the exploration of scent in art.

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

These century-old townhouses contain some of the first car garages built in the United States.

This unique house, the only one of its kind in Brooklyn, was built as part of a real estate developer's showcase.

This unusual subway stop was originally a real estate office.

A curious friendship between two inanimate ladies.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

A hidden architectural treasure in New York's Brooklyn.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Abandoned power station once home to a squatter community, now being developed into an arts center.

Detailed facade of a brownstone in Boerum Hill.

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

This innocent-looking townhome is actually a subway exit.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

This collection of neon icons is preserving Arizona's history, one sign at a time.

This church on a Tohono O'Odham reservation has stood since 1797.

The short oil boom of Venice Beach, and its swift removal from the tourism-laden landscape.