This mysterious artificial cave has long puzzled New Englanders.

This tower pays homage to a legendary Viking fort established in Massachusetts that never really existed.

A historic Montreal market that was the city's agricultural hub for over century.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

Second largest wastewater treatment plant in the country.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

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

In the 19th century, this was the center of Boston's Black community.

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

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

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

Dedicated to one of the darkest moments in Irish history.

This supermarket is suspended 25 feet above an interstate highway.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

The world's largest piece of copyrighted artwork.

This series of landscape dioramas tell the story of New England forestry in exacting miniature detail.

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

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

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

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

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

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