Hidden beneath the streets of London is a secret subway that only carried mail.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

This bridge is haunted by the ghost of a distraught mother.

A site of pagan worship which still attracts people looking for fairies.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The site of a tragic massacre that spawned a multimedia franchise.

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

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

Burial ground for revolutionary veterans attracts tall tales, ghost hunters, not enough historians and preservationists.

Said to be one of Sweden's most haunted places, this vicarage once even attracted a ghost-busting priest.

This shell of a historic manor house on the Isle of Wight is said to be the most haunted site on the island.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

This 13th century castle is chock full of ghosts and impossibly rare cows.

This mouldering abandoned mental hospital was once a center for progressive healing.

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

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

This historic crypt was said to have been designed and built by the very person who is buried inside of it.

This Danish castle is supposedly haunted by a woman too independent to not be a witch.

"The House That Love Built" is shying away from "The House That Ghosts Love."

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

Mysterious library of an infamous financier and spiritual seeker.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.