This semi-hidden Manhattan restaurant is based out of a loading dock.

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

NYC's legendary underground network for bovine transportation.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

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

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

Detailed facade of a brownstone in Boerum Hill.

The largest earthwork effigy in the world.

Rippling sand dunes frozen in the Arizona rock.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

A collection of 4,000 thimbles that's more versatile than one might imagine.

The largest collection of handbags in the world, the oldest of which were used to carry Bibles, primarily by men.

This collection of hand fans doubles as a history of femininity.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A hollow cement depiction of time's inexorable effect on the human body.

An abandoned concrete jungle surrounded by a lush park.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

This is not your typical jungle gym.