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

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

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

A bizarre house filled with an astounding array of collections.

Outsider art meets paleontology at this roadside reptile repository.

The taxidermy remains of the most popular pony in children's literature.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This old estate is a remnant of when the Bronx was a popular summer destination for wealthy New Yorkers.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

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

A domino effect created with Britain’s iconic telephone boxes.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

This last stalwart of the now-forgotten feminist restaurant movement has been serving food in an activist atmosphere since 1977.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

Though the original building has been demolished, these massive bronze doors were saved.

For 20 years, local pumpkins have met their fate on the iron fence surrounding this Cobble Hill home.

In 2013, historians discovered a hidden room devoted to the art of making royals' hot chocolate.

A giant knight, sex education, date shakes, and Jesus coexist happily in this Coachella Valley desert oasis.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

Three prestigious academic collections come together to create a world-class natural history museum.

Impossibly life-like natural history models created out of glass by a father and son.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."