America's largest man-made forest was planted in an effort to bring back the past.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

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

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

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

The rogue roots are gradually consuming some of the historic marble grave markers.

This taxidermy horse was a Civil War hero.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The house where John Wilkes Booth conspired with his co-conspirators.

There’s a hidden military meme engraved on the World War II Memorial.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

The only arched bridge made of stone on the entire Mississippi River.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

A Northwoods sporting competition that shows lumber jacks doing much more than cutting down trees.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.