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

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

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

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

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

This memorial honors those who served on Gallops Island Radio Training Station during the second World War.

Narrowest house in Boston.

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

Tragedy on Little Brewster Island memorialized.

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

Stolen goods adorn the organ at Old North Church.

"Mock all and sundry things, but leave the saints alone."

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 tower commemorates the spot where George Washington hoisted the Grand Union flag.

A unique columnar residence built in the 19th century.

A home decorated by its owner with eye-catching and captivating assemblages of found objects

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

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.

Eliot was the first missionary to produce religious text for Algonquians in their own language.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

She become one of the first women to serve in the United States military by secretly dressing like a man.

Ornate and macabre headstone in one of the country's oldest cemeteries.

This Gothic castle was inspired by Erik the Red's Viking residence at Brattahlid in Greenland.