A crumbling hospital from the 1850s on Roosevelt Island.

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

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

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

New York's oldest and possibly grandest keeper of books.

This 220-year-old house is a reminder of New York City's Dutch past.

The site of the deadly Triangle Shirtwaist Factory Fire.

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

Historical figures from New York City's Catholic community reside in Midtown.

The greatest real estate coup of all time.

Tucked in the back of this amazing antique store is an important piece of medical history.

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

A small part of lower Manhattan is actually made from a bit of England.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

A staggering collection of photographs depicting medical, social, and historical change.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

You don't have to be an ambassador to dine like one.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The personal library of the founder of modern neurology is open to visitors.

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

The curious underground history of keeping Paris clean.

A modern-day Lascaux cave underneath Paris.