Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

A giant open-air sculpture made of over 200 full-sized boats.

A tiny slice shop hides down an unmarked hallway in a Las Vegas casino.

An enormous illuminated figure dances on the Las Vegas strip.

Beautiful steampunk ghosts of early Massachusetts.

Narrowest house in Boston.

Historic Hull Street was actually the first street with a proper name in the Boston area.

The last remaining 19th-century tenement from Boston's old West End neighborhood.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

Dedicated to the neverending mathematical constant, this plaque next to a park bench was sponsored by an anonymous benefactor.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

A men’s restroom became a sandwich shop.

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

Visit a sweet shop selling one of the first candies ever made and sold in America.

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

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

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

An 80-year-old house built out of newspapers.

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

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.