The world-record holder for the longest bridge stretching continuously over water.

A mysterious find dredged from Louisiana waters.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

Like Mars, but much closer.

The small first-floor apartment where the author wrote her Pulitzer Prize-winning book 'Gone with the Wind.'

This historic oak tree has been around for over 300 years and might last for 300 more so long as it doesn't fall apart first.

Death comes to anyone who dares to touch this concrete column.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

An engraved boulder marks the spot where Patsy Cline's life ended in a plane crash.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

This simple, broken column marks the final resting place of one of America's most famous explorers.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

A historic and oft-filmed prison stands in a Chicago suburb.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

The final resting place of the world's first nuclear reactor.

First planned industrial community in the United States.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The humble gravesite of the man who failed to cash in on his Pepsi-cola goldmine.

From failed port town to Civil War fort, the ruins of this former defense saw their finest day in the television age.