This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

The first memorial dedicated solely to the Black troops who fought for the Union.

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

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

The oldest still-operating tavern in the United States was once owned by a pirate.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

All that's left of the quintessential "cabin in the woods."

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

Wander among the abandoned ruins of this once-powerful medieval town.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

The South Carolina competition challenges you to trap as much grits on your body as possible.

This old-fashioned roadhouse's quirky neon sign is as famous as its enormous dumplings.

This restaurant proudly displays bread signed by the 39th president.

No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

Its dark depths conceal millions of rare, delicate crystal formations.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

An ancient Viking village in North America that predates Columbus by 500 years.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.