An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

Site of a former hidden treehouse in New Orleans.

A pink cottage covered in hearts served as a haven and a resting place for LGBTQ activists.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Records of the dead describe the myriad odd ways people used to die.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Marie told fortunes from her small stand on the Boardwalk for decades, including to a young Bruce Springsteen who would busk outside her booth.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

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

The mummified relics of an American missionary.

Astonishing collection of helmets, scientific instruments, and medical models.

A tribute to the little-known group of women who were the first ever to fly aircraft in the U.S. military.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

Continuing the tradition of the dime museum in style.

Turning night into day in Victorian-era Austin to thwart a serial killer.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

Beyond being incredibly fun, not much can be said about the Hole with certitude.