This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A Manhattan office building is home to the world's largest chess board.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

An artist's cute bronze subway sculptures belie his violent artistic past.

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

Unique antiquarian shop specializing in globes, maps, and prints.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

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

More gold than anywhere else, ever.

A hands-on traveling collection of the innovative devices of yesteryear.

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

Elevated freight railway turned wildly successful urban park.

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

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

Climb right into the heart of this colorful Iceland volcano.

An encyclopedic collection of mammal penises.

Walk in the footsteps of the gods and straddle two tectonic plates.