A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A haunting collection of the vanished and disappearing natural world.

A battle between nature and architecture in the Cambodian jungle.

A curious collection dedicated to human and animal anatomy and pathology.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Home of an evil witch famous within southern folklore.

This abandoned amusement park was built on a site with a dark history.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.