The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A giant time capsule not scheduled to be cored until 2040.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.

Two flush headstones mark the only known graves to be embedded in an airport runway.

A statue honoring 44 continuous years of greeting passing ships.

Georgia's highest point was given its strange name thanks to a simple translation error.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

A brick-paved former section of the historic coast-to-coast highway.

Part of a secret 1970s nuclear defense program is now open to the public.

A rim-made reptile in North Dakota.

The world's tallest turtle riding the world's largest snowmobile.

On the windswept Dakota plains there is a memorial to circus workers who were struck down by lightning.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

One man's ambition created this psychedelic log home.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

Built after the 1991 discovery of one of the world's most complete T.rex skeletons in the nearby hills.

Ride aboard a centuries-year-old steam engine and explore dozens of trains parts, including an unusual "comboose."

Home to a full cast of the largest woolly mammoth ever recovered in North America. 

An auroral research program that superheats the ionosphere.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

The ghostly remains of what was once the world's richest copper mine.