The heroic sled dog of the 1925 serum run is preserved in taxidermy.

A historic gristmill that still produces flour and grits the old-fashioned way.

A handful of beehive kilns are all that’s left of a historic brick-making empire.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This replica of the Greek structure is in the heart of Nashville.

A quaint amusement park now sits, rusting and forgotten among the foliage.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Paths are maintained, but trees have taken over plots.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This North Carolina grave is the final resting place of the world's most famous conjoined twins.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

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

Oldest unrestored plantation house in America that is open to the public.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.