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

Second largest wastewater treatment plant in the country.

Hill-like structures formed by glaciers and sandy spits of land.

This parking garage was the site of what was - at the time - the largest cash robbery in history.

This beautiful architectural gem was the first waste treatment facility in Boston.

This supermarket is suspended 25 feet above an interstate highway.

This Cape Cod museum exhibits what it claims is the only authenticated pirate treasure in the world.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

Solar powered Spectacle Island features all-green facilities.

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

The world's largest piece of copyrighted artwork.

Located in Faneuil Hall, the headquarters of the Ancient and Honorable Artillery Company of Massachusetts has stood the test of time.

The hill that gave the Massachusett tribe, and later the state, its name.

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

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

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

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.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

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

The Burnside Fountain and its questionable interpretation.

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

Tragedy on Little Brewster Island memorialized.

Artifacts of whaling, with both its perils and adventure, are housed in this museum in a former candle factory.