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

This is the house that spite built.

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

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

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

MIT students continue the legacy of beloved professor "Doc" Edgerton through learning by doing.

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

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.

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

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

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

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

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