Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

The mosaic Star of David at the front of this store hints that it's no ordinary Italian grocer.

You must take the A train... to the last active cemetery in Manhattan.

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

Frozen in Norway, vended in Singapore.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

Architectureal fantasy quarter of Rome.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Willy Wonka would love this weird half-a-home.

This Toronto garden collects stares and tchotchkes in equal measure.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

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

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

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