Beautiful steampunk ghosts of early Massachusetts.

An enormous, inside-out glass globe built in 1935.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

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

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

An eccentric inventor's castle home with its own indoor weather system.

This impressive Boston holy house is the American mecca for Christian scientists.

The massive machine creates cracking displays of indoor lightning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Mile-long cave system near Great Smoky Mountains.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

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

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

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

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.