A spiritual vortex among the red rocks in Sedona.

The loneliest island in New York.

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

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

A crumbling hospital from the 1850s on Roosevelt Island.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

An unsettling shrine dedicated to the ravenous beast that prowled 18th-century France.

A sanctuary for wolves in a community which once trembled in fear of the murderous "Beast of Gévaudan."

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

A chapel on a volcanic core, marking the end of a successful journey.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

This isolated community does not want you to visit.

Wander among the abandoned ruins of this once-powerful medieval town.