The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.

Visit the monolithic tomb of America's most famous general.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

Rummage through this sunken ship, but leave your scuba gear at home.

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

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

An unassuming secret door once led to a legendary watering hole.

There must be a pun in this haystack somewhere...

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

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

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

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

Elevated freight railway turned wildly successful urban park.

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

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

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

A very classy 1920s-era bar right in Grand Central Station.