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

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Eternal resting place of the grave robber and murderer who served as inspiration for many of cinema’s famous madmen.

The legacy of an unsolved, gruesome murder rests beneath the spans of this historic bridge.

Tucked in the back of this amazing antique store is an important piece of medical history.

Radical Bookstore and Community Space.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Towering basalt columns, a creation of fire and ice.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

One of the best collections of wax anatomical models in the world.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

A stone wall that mysteriously moved three feet from its foundation.

Home to a protest movement, a bombing, and a dramatic change in labor history.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

A house of bones — but nobody is quite sure to whom they belong.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The world's largest bioluminescent area was undiscovered by science until 2005.

A forest of phallic offerings found in a quiet corner of a hotel car park.

A gothic church spire sits atop this skyscraper, the tallest church in the world.