Memorial to a beloved puppeteer as well as all street performers.

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

This massive World War II calculator hearkens back to the days when "computer" was a job title.

"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."

The haunting history of a little girl lost.

This supermarket is suspended 25 feet above an interstate highway.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

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

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

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

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

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

Whimsical cookie-themed plaques mark the birthplace of the Fig Newton.

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

This plaque is dedicated to one-half of the Magliozzi brothers and their hit radio show, 'Car Talk.'

This is the house that spite built.

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.

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

The massive machine creates cracking displays of indoor lightning.

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."