Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

Join in a Seance at the Swedenborgian Church.

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

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Two New York rooftops are home to the largest rooftop soil farms in the world.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

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

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

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

Little Red Lighthouse under the George Washington Bridge.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

One of the last Jazz Age "Wonder Theaters" in New York City.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

A Manhattan Episcopal church with an eerie underground crypt.

An unusual round church in London with a Templar past.