These massive concrete balls were used to mine gold in Virginia.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

In the heart of Brigham Young's promised land sits a festering plot of industrial ruin that has been claimed by society's outcasts.

The last SR-71 ever constructed.

This lonely gas station has stood at this location since 1917.

The unusual patterns in this rock formation result from two distinct modes of weathering.

This giant ice cream cone is the last remaining icon of a Salt Lake City staple.

A tunnel with windows, so you don't miss out on the impressive views.

An empty mine that some believe will suddenly be filled with fortune and treasures at the end of the world.

This large, castle-like structure is hidden amid the mountains on the grounds of the Utah State Hospital.

A former major munitions plant that has been converted into a sprawling art space.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

The land is home to swimming ponies and a legendary 18th-century treasure.

These lush botanical gardens employ the most purrfect pest control force.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The time thousands of bags of chips washed ashore in the Outer Banks is memorialized in a local museum.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

Visitors to this library are in for a real-world education in modernist architecture.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.