The oldest playground in America.

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

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

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

One of the last remaining movie theatres in the country that features a rear-projection system.

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

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

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.

A tiny monument to the classic American candy.

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

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

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

One of America's most historic homes also holds a startling literary legacy.

A small plaque promises cold, hard cash in exchange for work by the famous pop artist.

This is the house that spite built.

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

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

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

Second largest wastewater treatment plant in the country.

A lighthouse on a diminutive island was one of the first of its kind to guide seamen home.

Step into a pastel time capsule where candy is truly dandy.

Century-old shop, specializing in Occult products.