A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A terrific purveyor of natural history objects and curios.

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

A hidden bar inside an ad agency has a deliberately misleading name, so employees can stay late under pretext of paperwork.

A hidey-hole sandwiched between cellphone, DVD, and jewelry stores features Tibetan delights.

This small, hidden cove is home to abandoned boats.

Museum preserving torture methods from the past.

A floating cat sanctuary on an Amsterdam canal.

One of only three fountains created by the iconic architect Friedensreich Hundertwasser.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

There must be a pun in this haystack somewhere...

Little Red Lighthouse under the George Washington Bridge.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Hear the tales of New York's most notorious criminals.

This innocent-looking townhome is actually a subway exit.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The famous author's cottage hideaway.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

Detailed facade of a brownstone in Boerum Hill.

A hidden "place of interment for gentlemen."

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A living archive of urban activism and space reclaimed.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.