Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

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

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A Manhattan office building is home to the world's largest chess board.

New York City's first Modernist house.

Read a book next to a Midtown waterfall.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

The most photographed house in Maine looks good enough to eat.

The world's oldest and largest museum of mass transit vehicles.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

This World's Fair showpiece was built in Chicago, but shipped to Maine.

This overlooked street light once served as a KGB dead letter box.

The canine-themed book collection claims to be Europe's largest dog library.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

A monument to the conquistador became increasingly controversial in the very city that he founded.

Tucked behind the Institute of Neurological Science down a decrepit street resides the largest display of human brains in Latin America.

Now containing the bones of the actual conquistador, instead of someone else.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.