This 21st century cabinet of curiosities includes dinosaur bones, moon rocks, film memorabilia, and more.

Exotic, erotic, and esoteric, one artist's live-in Bali gallery brings a splash of color and madness to its surroundings.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

This small New York museum celebrates the mountainous artwork of a Russian mystic.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Unique antiquarian shop specializing in globes, maps, and prints.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

An arcade packed with a rotating collection of unique independent video games.

A controversial magical figure is hidden within a diorama of the city.

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

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

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The beloved home to all publications indie, erotic, and punky.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

Built in 1899, this luxurious home was part of one of the first gated communities in Los Angeles.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

New York's oldest and possibly grandest keeper of books.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

A young woman's senseless murder led to the controversial psychological theory of the "bystander effect."