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

This neo-Gothic former auto showroom is one of the few remaining reminders of Brooklyn's "Automobile Row."

A Wisconsin kitsch palace from the 1930s lives its second life in 21st-century Brooklyn.

At this hidden studio, the dying art of taxidermy is alive and well.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

One of only two remaining Victorian-era greenhouses in New York.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The famous author's cottage hideaway.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

Oldest surviving example of a Dutch saltbox frame house in America.

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

Little Red Lighthouse under the George Washington Bridge.

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

A mass grave for victims of one of the city’s worst fires.

A curious friendship between two inanimate ladies.

Volunteer-run library dedicated to exploring five decades of activism history.

Abandoned power station once home to a squatter community, now being developed into an arts center.

A Manhattan Episcopal church with an eerie underground crypt.