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

This mysterious artificial cave has long puzzled New Englanders.

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

All that remains of the Whittall mansion are the ruins of the formal garden and its pergola, dedicated to the late Matthew J. Whittall by his widow.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Dedicated to one of the darkest moments in Irish history.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

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

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

The massive machine creates cracking displays of indoor lightning.

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

An enormous, inside-out glass globe built in 1935.

This railroad tunnel was once the longest in Massachusetts.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

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

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

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

A New England ghost town features a trail of boulders etched with intriguing life lessons.

This picturesque abandoned home is rumored to be a spite house.