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

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

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

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

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

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

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

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

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

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

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

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.

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

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

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

A tiny monument to the classic American candy.

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

The water in this preserved area spawns vegetation that gives it a deep green color.

A "gateway" into Mexico's northern border, represented by an abstract red tower.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

See no evil, hear no evil, speak no evil.