On a wall in Cleveland, Ohio find the story of a highly connected fictional community of organisms that created remarkable, lasting structures.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

A collection of Witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

The secret wartime bunker built on the platforms of an abandoned Tube station.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

This 1920s Dutch barge is now a floating bookstore.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

A network of concealed passageways lies within a busy London Underground station.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A memorial to a dog that inspired rioting in the streets of London.

A friendly pub with a sordid past in cock fighting.

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

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

The monster at the center of the Darwin Center Spirit Collection.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The remains of Crystal Palace Great Exhibition of 1851.