Sniff the Titan Arum's rotting flesh.

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

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

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

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

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

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

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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

Remnants of a forgotten 1920s speakeasy and Prohibition-era murals were discovered in its basement.

This remarkable collection devoted to the study of fish includes 1 million preserved specimens from all around the world.

One of the largest Buddhist communities in the West sits on the site of an old hospital.

A forensic lab dedicated to fighting crimes against wildlife.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.