This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This massive airship factory is so large that it has its own indoor weather.

This railroad tunnel was once the longest in Massachusetts.

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

Welcome sign announcing Haverhill, MA, as the birthplace of horror rocker/artist/director Rob Zombie.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

A cave dug by a man directed by ghosts to find pirate treasure.

"Try not to knock anything over!"

One man’s hobby is another man’s world of metal wonders.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The headquarters in Salem doubles as an occult art gallery.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The oldest living cultivated fruit tree in North America.

This historic graveyard monument is dedicated to a tragic victim of witch trial hysteria.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

This stone tower in a small town's graveyard looks as though it would be more at home in a fairy tale.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.