This unassuming stone commemorates a condiment factory gone up in smoke.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

This Massachusetts home was the first to have a telephone line and its own phone number: 1.

A unique columnar residence built in the 19th century.

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.

A tiny monument to the classic American candy.

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

A Harvard-area eatery preserves the uncovered tiles of its century-old predecessor.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

Stolen goods adorn the organ at Old North Church.

Final resting place of the author who wrote the ghost story "The Turn of the Screw," and his brother, the Harvard doctor and paranormal investigator.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

This is the house that spite built.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

Beautiful steampunk ghosts of early Massachusetts.

The world's largest piece of copyrighted artwork.

This beautiful architectural gem was the first waste treatment facility in Boston.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

No one messes with the Massachusetts sacred cod, not this time...