This tower is all that remains of a once-famed chapel.

Picturesque ruins once held off mighty armies.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

The cave where two British judges hid in exile after sentencing the king to death.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

Millions of numbers carved in glass represent the tattoos forced upon victims.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A mysterious stone embedded at the base of a historic Boston building.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This landmark cemetery in Boston was created more than 300 years ago.

Narrowest house in Boston.

The site of Paul Revere's historic two lantern warning.

The massive machine creates cracking displays of indoor lightning.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.