A former zoo turned public park, where visitors can hang out in the old animal cages.

Friction between grains of sand cause a curious "singing" sound.

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The hill that gave the Massachusett tribe, and later the state, its name.

Second largest wastewater treatment plant in the country.

The world's largest piece of copyrighted artwork.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

Ice cream stand, snack bar, and time capsule of milk conveyance.

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

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

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

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

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

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

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

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

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

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

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

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

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