A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Harlem park dedicated to compulsive hoarders killed by their own junk.

This speakeasy continues the Prohibition-era legacy of Harlem's jazzy Swing Street.

A memorial marks the library lobby where Langston Hughes' ashes are buried.

Rare moles meet activism at this Oaxacan eatery.

From scholastic to sepulchral - now under reconstruction.

Designed by famed 20th-century architect Cass Gilbert, the future of this abandoned 1908 rail station is currently in limbo.

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

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

The first and only carousel with a lineup entirely of insects.

Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

Because holiday cheer is at its finest when it includes eerie mannequins, right?

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

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

Hundreds of iconic jazz records were made in this church-like space.

The "Skinny House" is made from scrap, salvage, and a neighbor’s kindness.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

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

The real-life site of Ichabod Crane's infamous gourd attack.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.