The massive machine creates cracking displays of indoor lightning.

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

The world's largest piece of copyrighted artwork.

Two thousand artifacts from around the world collected by one woman who loved to travel.

One of the now-less-hidden floral gems of the "Emerald Necklace."

This hotel was the site of major events in sports and radio history. It was also used as a detention center during World War II.

Ice cream stand, snack bar, and time capsule of milk conveyance.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

A mysterious stone embedded at the base of a historic Boston building.

Stolen goods adorn the organ at Old North Church.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

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

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

This historic Boston building has gone from personal estate to porn theater and back again.

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

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

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

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

This kitschy tavern is also home to rare early editions of "Treasure Island."

A statue honoring 44 continuous years of greeting passing ships.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

This quirky curiosity shop takes its cues from the world's bazaars.

Performers, intricate sets, and a real speakeasy tell the story of the 18th Amendment.