The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A prohibition era watering hole for the police.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Bowl in splendor, if you're lucky.

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.

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

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Nondescript elevator doors open to reveal a stunning, surreal world.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Unrepaired walls from a 1920 anarchist bomb attack.

Become a prohibition rebel.

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

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

More gold than anywhere else, ever.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Ride the subways of yesteryear.

A dilapidated dock tells the story of Titanic's missed arrival.

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