A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

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

A former waterfront market is now in the center of town due to some interesting Boston engineering.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Real bones which are said to have belonged to a Polish dragon.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

World's first "penitentiary," meant to be humane, drove men insane.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A semi-scholarly approach to sex.

Tucked in the back of this amazing antique store is an important piece of medical history.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This hidden labyrinth offers walkers some brief peace of mind.

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

This supermarket is suspended 25 feet above an interstate highway.

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

Stolen goods adorn the organ at Old North Church.

One of the indelible moments of the American Revolution took place at this location.

Civil War Fort on an island in the Boston Harbor.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.