In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

A monolith replica monument of Jean Ribault commemorating the landing of the French in the New World.

Jacksonville's highways rendered this century-old grammar school unusable.

Largest gathering of hobos in the country has been meeting annually since 1900.

As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

The highway's southernmost spot is a beloved local attraction.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

The easiest way to the highest point in Wyoming is only accessible via one hefty fee.

A popular rock that acted as a waymarker for American pioneers.

Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

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

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

Storage units with a wartime past.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The national park was once a plantation estate.