One of America's first dinosaur parks gives a window into Depression-era paleontology.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

These colossal desert barcodes have been fine-tuning spy satellites for decades.

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This giant temperature attraction created some giant electric bills.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The eroded core of an ancient volcano is now accessible by a short hike.

It's safe—and permitted—to walk across these twin natural sandstone arches.

The fifth-longest natural arch in the world, and the longest outside China.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

An architectural oddity hides in plain sight on this iconic London bridge.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.