A bronze tribute to a legendary Californian, the self-proclaimed "Emperor of the United States."

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

A 550-square-meter micro-nation off the coast of Britain.

An abandoned town is hidden in Great Smoky Mountains National Park.

America's silhouette includes 100 square miles of wilderness jutting into Canada thanks to an old mapmaking error.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

Cherokee alphabet, proof of ancient North American Jews, or just a hoax?

The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

This mansion turned restaurant was once a pitstop for Al Capone during his travels.

One of the few existing, fully functional Showbiz Pizza animatronic shows.

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

You can climb to the summit of Black Mountain, as long as you sign the waiver.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

The most southern point you can drive to in the Western Hemisphere.

A recreation of an Old West apothecary full of curios.

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

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

Mysterious library of an infamous financier and spiritual seeker.

This largely forgotten piece of Cold War history stands hidden in the woods just north of the Mississippi Gulf Coast.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.