Mysterious 500-year-old tapestries depict a unicorn hunt.

A crumbling hospital from the 1850s on Roosevelt Island.

A New York warehouse filled with an enormous amount of goods saved from the landfills and donated for creative use.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

A massive art collective tries a new take on Brooklyn's DIY music scene—by making it fully legal.

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

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Former villa and estate of James Deering developed to preserve native tropical forests.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

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

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Eighteen miniature death-scene dioramas.

Macabre astrological automaton clock dating to the late 1400s.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Held in a fort that once stood for colonization of the area, this museum now tells the history of its indigenous people.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Tiny pyrophyllite spheres from 3 billion years ago.

Local legend has it that the first humans were created in the pools here, leaving their footprints behind in the rock.

Relics given to a Manhattan church to avoid seizure by the Italian government.