This 19th century machine put animals (including humans) in boxes to study how they metabolized calories.

No one knows who painted this mysterious mural in a Penn State basement.

Penn State's giant bug collection.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

A little piece of Paris in the sultry south of the U.S.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

An adorably sweet display of sculpted Precious Moments figurines.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

The world's only museum devoted solely to the art and collection of action figures.

Nature's biggest mammal swims in landlocked Oklahoma.

The largest land animal skull ever discovered.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

Only museum dedicated to women pilots, with personal artifacts from Amelia Earhart and other aviatrixes.

A museum honoring Oklahoma military service, where you can look into Hitler's mirror and see a Mickey Mouse gas mask.

Along the historic Mother Road is an old gas station with a secret counterfeiting past.

This unusually circular centenarian barn became a Route 66 icon.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

Built from oil field parts and resembling a teepee, this abandoned mid-century church is hoping for a comeback.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.