The massive machine creates cracking displays of indoor lightning.

Dedicated to one of the darkest moments in Irish history.

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

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

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

For over 20 years, Lil Toot has delighted guests with narrated boat rides between Stearns Wharf and Santa Barbara Harbor, becoming a beloved local legend and top-rated experience for visitors.

There aren't too many operational funiculars around, but Pittsburgh has two!

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

At Brandy Station, Civil War soldiers left their mark on the battlefield and the walls of this small wooden house.

The world's largest fully steerable radio telescope.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

A small Richmond island dotted with the remnants of hundreds of years of history.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

Most historians agree that the so-called "Gentleman Pirate" wasn't much of either of those things.

A steamer run aground near Bimini lives a second life as a playground for scuba divers.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Official museum, hall of fame, and repository of the Texas Rangers.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.